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.(Figure 1) shows the data from a force plate as a woman jumps straight up and then lands. Suppose that ?t = 0.24s .

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

2)How high did she jump?

Thanks!

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.(Figure 1) shows the data from a force plate as a woman jumps straight up and then lands. Suppose that ?t = 0.24s . 1)What was her speed as her feet left the force plate? 2)How high did she jump? Thanks!

Explanation / Answer

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

1: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=???

2: 0.3m (0.306m

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