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?

19.3 joules

21.9 joules

38.5 joules

43.0 joules

50.8 joules

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?

19.3 joules

21.9 joules

38.5 joules

43.0 joules

50.8 joules

anonymous · Answer

1. Elastic collision means Kinetic Energy is conserved
2. Calculate the KE before collision
2. It wil be the same after collision