Choice-'b' says the formula for kinetic energy in words.
KE = (1/2) · (M) · (S²)
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
100. A centimeter is a 100th of a meter.
A straight line represents a constant. It means that the speed is changing constantly in equal amounts over equal periods of time.