A ball thrown horizontally at 20.0 m/s from the roof of a building lands 30.0 m from the base of the building. How tall is the building?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.

Photons with the highest energy have the longest period