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Your vertical speed is zero when you're at the highest point of your jump. After that, it
begins to grow again, but in the downward direction. Your vertical speed is the same
when you hit the ground as it was when you left the ground, but in the opposite direction.
Your horizontal speed doesn't change. It's the same when you hit the ground as it was
when you left the ground, and in the same direction.
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∙ 14y ago
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Which of the following is true at the point where you reach the top of your jump on a trampoline?
At the top of the jump, your speed is changing from upward to downward speed, so there's an instant there where your speed is zero. -- Potential energy is max, because your height is max. -- Kinetic energy is zero, because your speed is zero.
Can an object be accelerating when it speed is zero?
Yes. There can be an instant during a period of acceleration when speed is zero. We can think of two examples right away: 1). Drop an object from your hand. As soon as you release it, downward acceleration begins immediately, but speed is zero. 2). Toss an object (like a baseball or a stone) straight up. Downward acceleration due to gravity begins immediately. At first, its effect is to reduce the upward speed. As soon as the upward speed is all gone, downward speed begins. Acceleration is constant throughout, but at the instant when upward speed becomes downward speed, the speed is zero.
Can particle have zero speed and non zero velocity?
No.
Can you have kinetic energy without momentum?
We don't think you can. Here's our reasoning: -- Kinetic energy of an object is [(1/2)(mass)(speed)2]. If kinetic energy is not zero, then mass can't be zero, and speed can't be zero either. -- Momentum of the object is [(mass)(speed)]. If mass isn't zero and speed isn't zero, then momentum isn't zero.
Can an object have a speed of zero and the acceleration not be zero?
Yes, but only at one instant. For instance, if you throw an object straight up, when it reaches the highest point its instantaneous speed is zero, but of course its speed is changing - thus, acceleration is non-zero.
Which of the following is true at the point where you reach the top of your jump on a trampoline?
At the top of the jump, your speed is changing from upward to downward speed, so there's an instant there where your speed is zero. -- Potential energy is max, because your height is max. -- Kinetic energy is zero, because your speed is zero.
How do you prove that instantaneous velocity is zero if average velocity is zero over the same time period?
You can't prove that, because it's not necessarily true. All you can say isthat if the average is zero, then there must be some point during that timewhen the instantaneous is zero.If the average over some time period is zero, then one of two things must be true:-- Either it must be zero at every instant during that time,-- or else the (speed x time spent at that speed) moving forward must be equal tothe (speed x time spent at that speed) moving backward.If it's zero at every instant during that time, then of course the instantaneousvalue is zero at every time during the period. (We just said the same thing twice.)If the second condition is true, then there was some positive speed and somenegative speed at different points during the time. In order to change fromforward speed to backward speed, it has to be done gradually (continuously),so there must be some instant when it's zero.
Is it possible to have a situation in which the speed of a particle is always zero but the average speed is not zero?
No. If the speed is always zero, then the average of its speed at any two points in time is also zero.
Can an object be accelerating when it speed is zero?
Yes. There can be an instant during a period of acceleration when speed is zero. We can think of two examples right away: 1). Drop an object from your hand. As soon as you release it, downward acceleration begins immediately, but speed is zero. 2). Toss an object (like a baseball or a stone) straight up. Downward acceleration due to gravity begins immediately. At first, its effect is to reduce the upward speed. As soon as the upward speed is all gone, downward speed begins. Acceleration is constant throughout, but at the instant when upward speed becomes downward speed, the speed is zero.
Does jump roping improve speed?
It will increase the speed at which you can jump rope. It won't effect the maximum speed of your mini-van however.
Why is speed important for high jump?
you need speed in triple jump to gain momentum to propel your forward in the jump. without it your jump will not be that far
Can particle have zero speed and non zero velocity?
No.
Can the average speed of a body be zero and can the average velocity of a moving body be zero?
Since speed is a scalar quantity, the only way the average speed can be zero is if the instantaneous speed is at all times zero, making it not a moving body, so no on the average speed. The average velocity, on the other hand, can easily be zero. The simplest example is you running in a circle.
Can you have kinetic energy without momentum?
We don't think you can. Here's our reasoning: -- Kinetic energy of an object is [(1/2)(mass)(speed)2]. If kinetic energy is not zero, then mass can't be zero, and speed can't be zero either. -- Momentum of the object is [(mass)(speed)]. If mass isn't zero and speed isn't zero, then momentum isn't zero.
Which flags are checked after instruction JNC and JNZ?
JNC is Jump No-Carry, so the carry flag is checked. JNZ is Jump No-Zero, so the zero flag is checked.
In sonic unleashed Xbox 360 where and how do you get light speed shoes?
you get the light speed shoes in Chun-Nan, and you can get the wall jumping shoes in Spagonia!not! the light speed shoes is in Shamer!
Describe the motion of a bus whose accelaration is zero but the speed is not zero?
It is slowing down. The bus is not picking up speed--accelerating--and its speed isn't zero, as it is not completely stopped. ------------------------------------------------------------------------------------------------------------ The above answer is incorrect as slowing down indicates a negative acceleration not a zero one. The correct answer is that the bus is at a constant speed - any constant speed.
