A) a 50 kg gymnast jumps from the balance beam with a speed of 1.7m/s. she lands upright on the ground 124cm below. at what speed will she hit the ground b) on landing she bends her knees through a height of 0.1m determine the average force exerted by her legs during the landing

PART a)

By energy conservation we can say

divide whole equation by mass "m" and plug in all given data

so gymnast will reach the floor with speed 5.21 m/s

PART b)

Now the gymnast bend her knees by 0.1 m and comes to rest

so here we will have

now the force on the gymnast will be

so during landing the force will be 6798.5 N

the bal will not change its velocity.