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A 12 kg rock falls from rest off a cliff and hits the ground in 1.5 s What is the velocity?
Wiki User
∙ 14y ago
The acceleration of gravity is 9.8 meters/sec2.
In 1.5 seconds after it's dropped, any object is falling at (9.8 x 2) = 19.6 meters/sec.
The mass of the rock makes no difference.
Wiki User
∙ 14y ago
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If rock at rest falls off a cliff and hits the valley below after 3.5 seconds what is the rocks velocity as it hits the ground?
The final velocity of a falling object can be worked out by the use of the formula a = (v - u)/t a = acceleration due to gravity = 9.8 m.s-2 v = final velocity = unknown u = initial velocity = 0 t = time taken = 3.5s Factor these known values into our equation 9.8 = (v - 0)/3.5 rearrange the formula to workout the unknown value v = 9.8 x 3.5 Final velocity on impact with valley floor = 34.3 m.s-1 with a downwards direction
A bullet fired horizontally over level ground hits the ground in 0.5 seconds If it had been fired with twice the speed in the same direction it would have hit the ground when?
Assuming no affects from air and a smooth geography, both bullets would fall at the same rate of 9.81 m/s^2 toward earth, and hit the ground simultaneously. You have to look at the bullet's velocity as having a horizontal and vertical velocity vectors. The vertical velocity vector is independent from that of the horizontal. The horizontal vector would be the speed at which the bullet is fired, and the vertical vector is the speed at which the bullet falls due to gravity.
Do you agree with the statement an object with a zero velocity can have an acceleration greater than yero?
Of course. Toss a stone straight up. -- From the moment it leaves your hand until the moment it hits the ground, it has constant acceleration ... the acceleration of gravity, around 10 meters per second2. The number isn't important, only the fact that the acceleration of the stone is not zero until it hits the ground. -- Velocity-wise: The stone starts out with some upward velocity, which steadily decreases until it's at the top of its arc, then the velocity becomes downward and increases until the stone hits the ground. -- At the very top of the arc, there is a point where the velocity changes from upward to downward. In order for that to happen, there must be an instant when the velocity is zero. -- But the acceleration is constant and not zero, even at that instant when the velocity is zero.
A penny that was dropped hit the ground in 4.5 seconds what was the velocity of the penny?
Simply use the expression v = gt g = 9.8 m/s^2 and t given as 4.5 s So velocity with which the penny hits the ground will be 44.1 m/s
What is the magnitude of the velocity of a vertical projectile at its maximum height is equal to?
The horizontal component of a projectile's velocity doesn't change, until the projectile hits somethingor falls to the ground.The vertical component of a projectile's velocity becomes [9.8 meters per second downward] greatereach second. At the maximum height of its trajectory, the projectile's velocity is zero. That's the pointwhere the velocity transitions from upward to downward.
If a rock falls at rest off a cliff and hits the ground in 1.5s what's the rock's velocity?
14.20m/s/s or 14.20m/s2 (the 2 is suppose to be the square sign)
A 12 kg rocks falls from rest off a cliff and hits the ground in 1.5 s.without considering air resistance what is the rock s velocity just before it hits the ground?
The velocity is gravity acceleration x time or (9.8)(1.5) = 14.7 m/s. The velocity is not dependent on the mass.
What happens as an object falls from earth?
the velocity of the object increases until it hits the ground
A rock is dropped from a cliff and hits the ground 6.0 seconds later How high is the cliff?
176.4 meters
What happens an object falls?
It falls, accelerating constantly until it hits the ground.
What falls often but never hits the ground?
The temperature.
If rock at rest falls off a cliff and hits the valley below after 3.5 seconds what is the rocks velocity as it hits the ground?
The final velocity of a falling object can be worked out by the use of the formula a = (v - u)/t a = acceleration due to gravity = 9.8 m.s-2 v = final velocity = unknown u = initial velocity = 0 t = time taken = 3.5s Factor these known values into our equation 9.8 = (v - 0)/3.5 rearrange the formula to workout the unknown value v = 9.8 x 3.5 Final velocity on impact with valley floor = 34.3 m.s-1 with a downwards direction
When air resistance balances weight the velocity becomes?
Terminal. It stays at that one velocity til the object hits the ground.
How does the total energy change when when a falling rock hits the ground?
when the rock falls it gain kinetic energy when it falls.
What happens when a tree falls down?
it hits the ground
A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff How fast was the ball thrown?
10 m/s
A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground?
A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity of the ball the instant before it hits the ground?
