physic
posted by quaviz on .
1) A 2 . 3 kg object moving at 7.3 m/s collides inelastically with a 4.0 kg object which is initially at rest.
What percentage of the initial kinetic energy of the system is lost during the collision?

Assume that total momentum is conserved, and that they have the same final velocity. Compute that velocity, V, using
2.3*7.3 = 6.3 V
V = 2.665 m/s
Compute initial and final kinetic energies.
Initial: (2.3/2)*(7.3)^2 = 61.3 J
Final: (6.3/2)*(2.665)^2 = ___ J
Compute how much KE is lost and divide it by the initial KE 
final=22.4J
22.4J/ 61.3J (initial)