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

These are the choices but please dont just give me a letter if you can explain it
I want to learn how
19.3 joules
21.9 joules
38.5 joules
43.0 joules
50.8 joules