Question

A ball of mass m1 experiences a perfectly elastic collision with a stationary ball of mass m2. what fraction of the k.e. does the striking ball lose if,
a.it recoils at right angles to te original direction of motion, and
b.the collision is head on

Answer 1

Well , since the collision is elastic and we know that the kinetic energy before and after the collision remain conserved  so it does not matter the balls collision occur at right angle or 90 degree  and also the head on collision also does not matte ,  So there will be no loss of kinetic energy in both of the causes as the question already said the collision is perfectly elastic.

Hope this will helps you.

Answer 2

Answer:

HOPE THE ABOVE GIVEN ATTACHMENT WILL HELP YOU........