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## Homework Statement

A small (65g) steel ball bearing is attached to a 50 cm long string as shown (link below) The ball bearing is lifted (with string stretched) to an angle of 55 degrees and released from rest.

a) when the small bearing reaches its lowest point it collides with another steel ball bearing of larger mass (150g) on a string of the same length. if the collision would have been elastic, to what maximum angle would each bearing reach after the collision.

b) if the small ball bearing actually bounces back to a maximum angle of 15 degrees( collision was NOT elastic), to what maximum angle will the larger ball bearing reach?

c) if the bearings behaved as stated in part (b) how much energy is lost during the collision.

http://s615.photobucket.com/albums/tt233/gaby596/

click on the only image there called pendulum problem thanks!

## Homework Equations

this are the ones i think should be used

v1=m1-m2/m1+m2*v initial

v2=2m1Vi/(m1+m2)

and the equations for finding delta KE and Delta PE

## The Attempt at a Solution

ive tried it several different ways but i keep getting the wrong answer ive seen the right answers from a answer sheet but they show no explanation on how to work it out