A 30-Kg Object Moving in the Positive X Direction Has a a One-Dimensional

Multiple Choice

A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?

A) 6.0 m/s
B) 7.0 m/s
C) 4.5 m/s
D) 8.0 m/s
E) 5.5 m/s