Researchers often use force plates to measure the forces that people exert again

Question

Researchers often use force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how the reading changes with time. The figure shows the data from a force plate as a woman jumps straight up and then lands.

A) What was the vertical component of her acceleration during push-off?

B) What was the vertical component of her acceleration while in the air?

C) What was the vertical component of her acceleration during the landing?

D) What was her speed as her feet left the force plate?

E) How high did she jump?

Explanation / Answer

I hate masteringphysics very much. I guess you are doing it too. I think we need to figure the weight of the woman is 500N/9.8=51kg A: (1000N-500N)/51kg=9.8m/s^2 B:because she is in the air and going the the up direction, and the direction of g(is the same as acceleration) is point to the ground, so the answer is -9.8m/s^2. C:landing force is 1500 and the still force is 500, so you got (1500N-500N)/51kg=19.6m/s^2 D:the time period is 0.25s, and a=(vf-vi)/t and vi =0,so a=vf/t we knew a is 9.8 so we got 9.8=vf/o.25s Now you can find vf=9.8*0.25s=??? E: I have no clue about the E part, so I just guess the answer, I tried twice and I got the right one is 0.3m (0.306m from masteringphysics). I am not sure about my processes are right but I am sure about the answers are right. One more time, Screw masteringphysics and Screw physics.

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