# Mechanics Problem

1. Nov 12, 2009

### Elumalai

A 40 kg seal at an amusement park slides down a ramp into the pool below. The top of the ramp is 2m higher than the surface of the water and the ramp is inclined at an angle of 45.0° above the horizontal. The seal starts from rest and reaches the water with a speed of 5.1m/s.
(a) What is the coefficient of kinetic friction between the seal and the ramp?

(b) How much work is done by kinetic friction?

Can anybody help me in solving the above problem. I am interested in getting practised in solving problems in physics at graduation level. A list of books where these type of problems are solved in all topics of physics ( Mechanics , Elctricity , Magnetism , Nuclear physics etc ) will be highly helpful to me.

2. Nov 12, 2009

### Pheo1986

ok. so you have the initial velocity, final velocity and hieght. from this you can find the acceleration.

you then know that f=ma and also that f=coefficient of kinetic friction * the reaction force. so now you have acceleration, mass and you can work out the reaction force useing the 45 degree angle, so just rearange to find the coefficient of kinetic friction.

hope this is a gd starting point for you