Diver physics

1. Oct 29, 2006

tennisacerg

A 65 kg person dives into the water from the 10 m platform.

a)What is her speed as she enters the water?

b)She comes to a stop 2.0 m below the surface of the water. What net force did the water exert on the swimmer?

2. Oct 29, 2006

Ja4Coltrane

Part A is simple kinematics.
recall Vf(sq)=Vi(sq)+2(a)(d)
(carefull--a=g which is negative.)

Part B is not realistic, but can be solved easily with an energy approach. Remember that gravity does a total work of (mg)(distance). Don't forget about the distance into the water--that matters. If the diver stops, the work by gravity is the same as the work by the water= (Fwater)(distance)

3. Oct 29, 2006

geoffjb

$$v_{f}^{2}=v_{i}^{2}+2ad$$