Collisions

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 0.25kg ball strikes a 1.25kg ball at rest. After the collision the 0.25kg ball is moving with a velocity of 18m?s

and the second ball is moving with a velocity of 9m/s. What is the initial velocity of the first ball?

• 63 m/s

• 78 m/s

• 103 m/s

• 44 m/s

A collision where two objects stick together and have the same final velocity is

• perfectly inelastic

• elastic

• inelastic

• nonexistent

Tags

112.45.c.7.E

A collision where two objects bounce and move separately while kinetic energy is conserved is

• perfectly inelastic

• elastic

• inelastic

• nonexistent

Tags

112.45.c.7.E

In which collision is momentum conserved?

• perfectly inelastic

• elastic

• inelastic

• all collisions

Tags

112.45.c.7.E

A 12kg ball moving at 37m/s strikes a second ball at rest. After the collision the 12kg ball is moving with a velocity of 19m/s and the second ball is moving with a velocity of 4m/s. What is the mass of the second ball?

• 35 kg

• 92 kg

• 18 kg

• 54 kg

A 10kg

ball moving at 13m/s strikes a 20kg ball at rest. After the collision the 10kg ball is moving with a velocity of 7m/s. What is the velocity of the second ball?

• 12 m/s

• 3 m/s

• 4 m.s

• 6 m/s

What happens to the total kinetic energy in an inelastic collision?

• It increases

• It remains the same

• It decreases

• It is completely transferred to potential energy

Why is the total kinetic energy generally not conserved in a collision?

• It is converted entirely into potential energy.

• It is converted to sound energy and internal energy.

• It is transferred to another object as kinetic energy.

• It remains constant throughout the collision.

Collisions where objects BOUNCE apart.

• inelastic collisions

• elastic collisions

• explosions

• none of these