Elastic Collision

A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision.  What is the velocity of the second ball after the collision? 

• 5 m/s
• 2.5 m/s
• 10 m/s
• 7.5 m/s

Which object listed below has the greatest momentum?

• A 0.05 kg object rolling at 0.2 m/s.
• A 0.15 kg object rolling at 2 m/s.
• A 0.15 kg object rolling at 1 m/s
• A 0.4 kg object rolling at 2 m/s.

If two objects have the same mass, then the faster moving object has ____________ momentum.

• more 
• less
• the same

The total momentum before a collision is _________ the total momentum after a collision.

• equal to 
• less than 
• more than
• It depends on the type of collision

If you double the velocity of an object, then its momentum will ______________.

• will double 
• will half
• will quadruple (x4)
• will be quartered (x 1/4)

2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

• Inelastic Collision

• Elastic Collision

• Perfectly Inelastic Collision

• No collision occurred

A 2.5 kg ball moving at 4.2 m/s collides with a 2.5 kg stationary ball. If the first ball is at rest after the collision, what is the velocity of the second ball? 

• 2.1 m/s
• 2.5 m/s
• 4.2 m/s
• 8.4 m/s

A 3,000 kg truck moving at +10 m/s hits a 1,000 kg parked car which moves off at +15 m/s. What is the velocity of the truck?

• 10 m/s
• 0 m/s
• 5 m/s
• 2 m/s

While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball's velocity was 10 m/s and the 8 ball was at rest. If both ball's have a mass of 0.15 kg and the cue ball's velocity after the collision is 2 m/s, what is the 8 ball's velocity?

• 2 m/s
• 8 m/s
• -2 m/s
• 1.5 m/s

Mr. Haggerty and Mr. Greenwalt have dressed up in sumo wrestling costumes. They form a perfectly elastic collision. Mr. H has a mass of 56 kgs and a velocity of 6 m/s. Mr. G has a mass of 43 kgs. After they collide Mr. H has a velocity of -2 m/s and Mr. G has a velocity of 8 m/s. What was Mr. G's initial velocity? Round to the nearest one decimal place. Don't write units