A 85.0 kg diver falls from rest into a swimming pool from a height of 3.10 m. It

Question

A 85.0 kg diver falls from rest into a swimming pool from a height of 3.10 m. It takes 1.56 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.



A ball of mass 1.9 kg hangs at the end of a string 1.4 m in length from the ceiling of a room. The height of the room is 3.6 m. What is the gravitational potential energy of the ball relative to the ceiling?

Tries 0/2
What is the gravitational potential energy of the ball relative to the floor?

Tries 0/2
What is the gravitational potential energy (in J) of the ball relative to a point at the same elevation as the ball?

Explanation / Answer

m=85 kg

h=3.10 m

t=1.56 s

u=0 m/s

s=ut+1/2at^2

3.1=0+0.5*a*1.56*1.56

a=2.54 m/s^2

F=ma

  =85*2.54

  =216.55 N

(ii)

  potential energy=mgh

   =1.9*9.8*3.6

   =67.03 J

relative to the floor=67.03 J

relative to the ball=0 J

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