1. ## collision

Two smooth spheres of masses km and m collide obliquely. the sphere of mass m is brought to rest by the impact. the coefficient of restitution for the collision is 1/k (k greater or equal to 1) Prove before the impact the spheres were moving perpendicular to each other.

i have worked out k=-1. I know the sphere of mass m was xi+0j before and 0i+0j after.

2. ## Re: collision

i have worked out the first part
the second part of the question is show that as a result of the collision the kinetic energy lost by the sphere of mass m is k times the kinetic energy gained by the sphere of mass km.
the kinetic energy lost by mass m sphere is .5mx^2
kinetic energy gained by mass km sphere is .5(km)(y)^2-.5(km)(a)^2
Any help?

3. ## Re: collision

Hey markosheehan.

What is the coefficient of restitution defined as?

4. ## Re: collision

The coefficient of restitution is a number which indicates how much kinetic energy (energy of motion) remains after a collision of two objects.

5. ## Re: collision

Hint - Do you have a formula in terms of kinetic and potential energy with regard to final and initial states?

6. ## Re: collision

sorry
can you give me any more hints i am still stuck