A ball is thrown downward from the top of a 30.0 m tower with an initial speed of 15.0 m/s. Assuming negligible air resistance, what is the speed of the ball just before hitting the ground?

A roller-coaster goes over a 12 m tall hill then approaches a 30 m hill. What is the minimum velocity the roller-coaster would need when going over the 12 m hill to make it to the top of the 30 m hill?   Question 4 options:   254.8 m/s   Not enough information to answer   18.78 m/s   15.96 m/s

A small block slides down a frictionless track whose shape is described by y = (x^2) /d for x<0 and by y = -(x^2)/d for x>0.  Here we go again this time, d = 4.13 m. Suppose the block starts on the track at x = 0. What minimum initial velocity (moving to the right) must the block have such that it will leave the track at x = 0 and go into freefall?      9.00 m/s      6.36 m/s      12.29 m/s      9.33 m/s

A 2.75 kg box slides UP a smooth (frictionless) 39-degree hill with an initial speed of 18.0 m/s. To what maximum height above the bottom of the hill does the box reach before stopping?

An attacker at the base of a castle wall 3.60 m high throws a rock straight up with speed 7.50 m/s from a height of 1.60 m above the ground. a) what is its speed at the top? If not, what initial speed must it have to reach the top? b) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.50 m/s and moving between the same two points. c) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? d) Explain physically why it does or does not agree.

A ball is dropped (from rest) from a window and hits the ground with a speed of 7.0m/s. If the ball were dropped from double the height, what would be its speed (in m/s) when it hits the ground?   Your Answer:

A brave cliff diver jumps off the cliff of Tropea, Calabria (Italy), from a height if 16.35 m, from rest. What is the speed with which the diver hits the surface of the water?

A ball is launched upward from a cliff 200ft above the ground with an initial velocity of 4ft/s. When does the ball hit the ground?

a skateboarder moving at 5.90 m/s along a horizontal section of a track that is slanted upward by θ = 46.0° above the horizontal at its end, which is 0.790 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, find the maximum height H to which she rises above the end of the track.

A child throws a stone downward from the top of a cliff with a speed of 4m/s. You notice that it took 2 seconds for the stone to hit the ground. What is the height of the cliff? (Start with a function for the acceleration using g ≈ 9.8m/s2 .