Conservation of Momentum (Easy)

A 3 kg steel ball moving at 8 m/s collides with a stationary steel ball of mass 2 kg. After the collision, both balls move in the same direction. The velocity of the 3 kg ball is 4 m/s after the collision. What is the total momentum before the collision?

• 24kgm/s

• 0kgm/s

• 11kgm/s

• 48kgm/s

A 3 kg steel ball moving at 8 m/s collides with a stationary steel ball of mass 2 kg. After the collision, both balls move in the same direction. The velocity of the 3 kg ball is 4 m/s after the collision. Fill in the blank to complete the first step when calculating the velocity of the 2kg ball after collision.

(8x3) + (2x_) = (3x4) + (2v)

• 0

• 4

• 8

• 3

A 3 kg steel ball moving at 8 m/s collides with a stationary steel ball of mass 2 kg. After the collision, both balls move in the same direction. The velocity of the 3 kg ball is 4 m/s after the collision. Fill in the blank to complete the second step when calculating the velocity of the 2kg ball after collision.

24 = 12 + 2v

__ = 2v

• 36

• 2

• 12

• 8

A 3 kg steel ball moving at 8 m/s collides with a stationary steel ball of mass 2 kg. After the collision, both balls move in the same direction. The velocity of the 3 kg ball is 4 m/s after the collision. Fill in the blank to complete the first step when calculating the velocity of the 2kg ball after collision.

24 = 12 + 2v

12 = 2v

v = _

• 10m/s

• 14m/s

• 24m/s

• 6m/s

What is the unit of momentum?

• m/s

• N

• kgm/s

• kg