Question

Julie has a mass of 49 kg and is standing on the 6 meter diving board? ( she is 6 meters above the water .) Julie drops from the diving board . What is Julies speed just as she hits the water

Answer 1

Use the kinetic energy formula:

KE = 1/2 m v^2

m= mass = 49 kg

v = speed

and the potential energy formula:

PE = m g h

g = 9.8 N

h= height = 6 m

PE = 49 x 9.8 x 6 = 2,881.2 J

Since PE = KE

2,881.2 J = KE

2,881.2 = 1/2 x 49 x v^2

2,881.2 = 24.5 x v^2

2,881.2 / 24.5 = v^2

117.6 = v^2

√117.6 = v

v= 10.84 m/s