Hey, so heres the question I'm stuck on (part b)
A particle P of mass 3m is moving with speed 2u in a straight line on a smooth horizontal plane. The particle P collides directly with a particle Q of mass 4m moving on the plane with speed u in the opposite direction to p. The coefficient of restitution between p and Q is e
a.) Find the speed of Q immediately after the collision
I calculated this to be Vq=(1/7)(2+9e)u
Given that the direction of motion of P is reversed by the collision,
b) find the range of possible values of e
I need some help on this one. Thanks TSR