HELP ME PLSS ASAP

What object a collides with object b and bounces back its final momentum is?

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.

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?