Amotor expends a given amount of energy in a certain period of time. if twice the energy is expended in half the time, its power 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.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

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