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The initial velocity of a dropped ball is zero in the y (up-down) direction. After it is dropped gravity causes an acceleration, which causes the velocity to increase.
F = ma, The acceleration due to gravity creates a force on the mass of the ball.
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Give an example in which velocity is zero yet acceleration is not zero?
Velocity is directional, so if something is accelerating in the opposite direction from the one it is moving it, there will come a point where it has 0 velocity but still has accelerating. If you throw a ball at the ground and it bounces, for example.
What is the terminal velocity of a bouncy ball?
Zero.
What is its velocity at the highest point of a ball vertically upwards?
In that case, the velocity is zero.
Can an object have zero velocity but still have an acceleration?
A simple example is a ball tossed into the air. When the ball reaches its apex -- its highest point -- its instantaneous velocity is zero. If we assume that up is the positive direction, the ball's velocity is positive when it is initially tossed into the air, but it slows immediately. That is, its velocity becomes less positive until it reaches zero velocity. After that point, the velocity becomes increasingly negative (because down is the negative direction). Until the ball returns to earth and reaches the height at which it was initially thrown, its average velocity is non-zero. If the ball is allowed to hit the ground, its average velocity will be slightly negative, which is still non-zero. But it still had an instant -- at its apex -- when its velocity was zero.
When Rae dropped a bowling ball from a height of 8 meters At which distance above the ground was the ball most likely moving at the greatest speed?
Still accelerating til it hits earth. ====================================== The height from which she dropped the ball is irrelevant. In any case, the ball was most likely moving at the greatest speed just as it hit the ground. The answer to the question is: zero.
If a small marble is dropped straight downward what is the initial velocity of the marble?
The initial velocity is zero. In most basic physics problems like this one the initial velocity will be zero as a rule of thumb: the initial velocity is always zero, unless otherwise stated, or this is what you are solving for Cases where the initial velocity is not zero examples a cannon ball is shot out of a cannon at 50 mph a ball is thrown from at a speed of 15 mph etc
Give an example in which velocity is zero yet acceleration is not zero?
Velocity is directional, so if something is accelerating in the opposite direction from the one it is moving it, there will come a point where it has 0 velocity but still has accelerating. If you throw a ball at the ground and it bounces, for example.
Can a body have zero velocity and still can be acclerating?
Yes. You are holding your hand out. A tennis ball is floating just above it. The velocity of your body relative to the ball is zero. Why is the ball floating? Because you and the ball and the whole elevator are accelerating down to the ground. ---- Here's a proof by reductio ad absurdum that it's possible: If it were not possible for a body to have zero velocity and be accelerating, once anything stopped moving it could never move again.
What is the terminal velocity of a bouncy ball?
Zero.
What is its velocity at the highest point of a ball vertically upwards?
In that case, the velocity is zero.
Can an object have zero velocity but still have an acceleration?
A simple example is a ball tossed into the air. When the ball reaches its apex -- its highest point -- its instantaneous velocity is zero. If we assume that up is the positive direction, the ball's velocity is positive when it is initially tossed into the air, but it slows immediately. That is, its velocity becomes less positive until it reaches zero velocity. After that point, the velocity becomes increasingly negative (because down is the negative direction). Until the ball returns to earth and reaches the height at which it was initially thrown, its average velocity is non-zero. If the ball is allowed to hit the ground, its average velocity will be slightly negative, which is still non-zero. But it still had an instant -- at its apex -- when its velocity was zero.
Rae dropped a bowling ball from a height of 8 meters. At which distance above the ground was the ball MOST likely moving at the greatest speed?
Still accelerating til it hits earth. ====================================== The height from which she dropped the ball is irrelevant. In any case, the ball was most likely moving at the greatest speed just as it hit the ground. The answer to the question is: zero.
When Rae dropped a bowling ball from a height of 8 meters At which distance above the ground was the ball most likely moving at the greatest speed?
Still accelerating til it hits earth. ====================================== The height from which she dropped the ball is irrelevant. In any case, the ball was most likely moving at the greatest speed just as it hit the ground. The answer to the question is: zero.
What is the velocity of a ball dropped on the surface of Mars if the acceleration of gravity is 3.7 meters per second squared?
When given a constant acceleration, just multiply it by time, t, to detemine the final velocity. If the initial velocity was zero (as is the case when you drop something), then the average velocity is half the terminal velocity.
What is the velocity of a stone dropped of a building 318 meters?
Ignoring any effects due to air resistance, the speed of the stone is zero at the instant it's dropped, and increases steadily to 78.98 meters per second when it hits the ground. The velocity is directed downward throughout the experiment.
A ball is thrown horizontally from a window on the second floor of a building What is the vertical component of its initial velocity?
If a ball is thrown horizontally from a window on the second floor of a building, the vertical component of its initial velocity is zero.
Will a ball drop rest reach the ground quicker than the one lunched from the same height but with and initial horizontal velocity?
No. What counts in this case is the vertical component of the velocity, and the initial vertical velocity is zero, one way or another.
