Question

A 70kg man jumps 1.00 meters down onto a concrete walkway. His downward motion stops in 0.02 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?

a. 15 500N
b. 7 010N
c. 4 900N
d. 3 500N

How do you solve this

Answer 1

force*timestopping= mass*velocity change

v= sqrt(2*9.8*1)= sqrt(19.6)
force= 70*sqrt(19.6)/.02

Answer 2

15 500 N

Answer 3

15 500N