TEST Elastic and Inelastic Collisions

A 2 kg toy car with a velocity of 5 m/s collides elastically with a second toy car that has a velocity of -2 m/s. After the collision, the 2 kg toy car has a velocity of 3 m/s and the second car has a velocity of 2 m/s. Using the conservation of momentum, what is the mass of the second car?

• 2 kg

• 1 kg

• 3 kg

• -- 2 kg

In a physics lab, a 10 kg mass is propelled at 6 m/s into a second 20 kg mass moving at 3 m/s. After they collide and bounce off each other, the 10 kg mass is moving at 2 m/s. Using the conservation of kinetic energy, find the velocity of the 20 kg mass after the collision.

• 25 m/s

• 15 m/s

• 5 m/s

• 35 m/s

Remembering the Law Conservation of Momentum two objects with masses of 50 kg and 20 kg respectively in an inelastic collision having an initial momentum of 15000 kg*m/s. What is the final momentum of this collision?

• 200 kg*m/s

• 120000 kg*m/s

• 15000 kg*m/s

• 214 kg*m/s