Question

Object A has of mass 7.20 kilograms, and object B has a mass of 5.75 kilograms. The two objects move along a straight line toward each other with velocities +2.00 meters/second and -1.30 meters/second respectively. What is the total kinetic energy of the objects after the collision, if the collision is perfectly elastic?

Answer 1

perfectly elastic means no energy lost in the collision

KE = 1/2 {[7.20 kg * (2.00 m/s)^2] + [5.75 kg * (1.30 m/s)^2]}

Answer 2

Bob