Two train cars of identical mass (m = 10.0 kg) collide and move off as shown. The yellow car was initially traveling at 2.0 m/s right and the green car was initially traveling at a velocity of
3.0 m/s left. After the collision, the yellow car is traveling at a velocity of 2.5 m/s to the left.

the bal will not change its velocity.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.