Please help me out please

What are the differences and similarities of a compression wave and a transverse wave?

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

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.