Calculate the net upward force on her at the moment the spring reaches its great

Question

Calculate the net upward force on her at the moment the spring reaches its greatest compression. Express your answer to two significant figures and include the appropriate units. Calculate her upward acceleration, in g's at that moment. Express your answer using two significant figures. An "extreme" pogo stick utilizes a spring whose uncompressed length is 37 cm and whose force constant is 1.8 x 10^4 N/m . A64-kg enthusiast is jumping on the pogo stick, compressing the spring to a length of only 8.0 cm at the bottom of her jump.

Explanation / Answer

A) net upward force =Kx-mg =1.8*104*0.08 - 64*9.8 =812.8 N

B) a=net upward force/mass =812.8/64=12.7 m/s2=1.3g

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