Exam 11: Impulse and Momentum

A 480-kg car moving at 14.4 m/s hits from behind a 570-kg car moving at 13.3 m/s in the same direction.If the new speed of the heavier car is 14.0 m/s,what is the speed of the lighter car after the collision,assuming that any unbalanced forces on the system are negligibly small?

Two objects of the same mass move along the same line in opposite directions.The first mass is moving with speed v.The objects collide,stick together,and move with speed 0.100v in the direction of the velocity of the first mass before the collision.What was the speed of the second mass before the collision?

A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s.If the collision is perfectly elastic,what is the change in the kinetic energy of the 620-g object?