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Worksheet: Elastic and Inelastic Collisions

Q1:

A child sleds down a hill and collides at 5.6 m/s into a stationary sled that is identical to his. The child is launched forward at the same speed, leaving behind the two sleds that lock together and slide forward more slowly. What is the speed of the two sleds after this collision?

Q2:

Two carts on a straight track collide head on. The first cart was moving at 3.6 m/s in the positive direction and the second was moving at 2.4 m/s in the opposite direction. After the collision, the second car continues moving in its initial direction of motion at 0.24 m/s. If the mass of the second car is 5.0 times that of the first, what is the mass of the first car?

Q3:

A 90.0-kg ice hockey player hits a 0.150-kg puck, giving the puck a velocity of 45.0 m/s. If both are initially at rest and if the ice is frictionless, how far does the player recoil in the time it takes the puck to reach the goal 15.0 m away?

Q4:

An alpha-particle undergoes an elastic collision with a stationary uranium-235 nucleus. What percent of the kinetic energy of the alpha-particle is transferred to the uranium nucleus? Assume the collision is one-dimensional.