Conservation of Momentum - WS - L11 - PHY

CHALLENGE: A 25 kg object moving at +15 m/s strikes a 15 kg mass moving at -10 m/s. If the 25 kg object moves off at -2 m/s, what is the velocity of the 15 kg object?

• 7 m/s

• -18.3 m/s

• 3 m/s

• 18.3 m/s

A truck of mass 500 kg moving at 4 m/s collides with another truck of mass 1500 kg moving in the same direction at 2 m/s. What is their common velocity just after the collision if they move off together?

• 7.2 m/s

• 2.5 m/s

• 3 m/s

• 5 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?

• 12.5 m/s

• 25 m/s

• 5 m/s

• 20 m/s

A ball X of mass 1 kg travelling at 2 m/s has a head-on collision with an identical ball Y at rest. X stops and Y moves off. What is Y’s velocity?

• 3ms⁻¹

• 1ms⁻¹

• 2.5ms⁻¹

• 2ms⁻¹

An object has a momentum of 55kgm/s and hits a stationary object setting it into motion. If the first object has a momentum of 13kgm/s after collision, what is the momentum of the second object? (1 Point)

• 42kgms⁻¹

• 68kgms⁻¹

• 4.23kgms⁻¹

• 32kgms⁻¹

A man of mass 50kg jumps out of a rowing boat of mass 300kg on to the bank, with a horizontal velocity of 3m/s. With what velocity does the boat begin to move backwards?

• 18ms⁻¹

• 0.5ms⁻¹

• 2ms⁻¹

• 116.7ms⁻¹

A boy with mass 50kg running at 5m/s jumps on to a 20 kg trolley travelling in the same direction at 1.5m/s. What is their common velocity?

• 4ms⁻¹

• -2ms⁻¹