Question

A ball of mass 2 kg is traveling towards you at 15 m/s. You are at...

A ball of mass 2 kg is traveling towards you at 15 m/s. You are at rest and have a mass of 75 kg.

Assuming you catch the ball, what is your final velocity?

Assuming the ball bounces off you and travels in the opposite direction with a velocity of 12 m/s, what is your velocity?

A car of 1200 kg travels east at 24 m/s while a truck of 2200 kg travels north at 19 m/s. They collide and stick together.

What is the momentum in the system?

What is the final velocity (magnitude and direction) after the collision?

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Answer #1

A ball of mass 2 kg is traveling towards you at 15 m/s. You are at rest and have a mass of 75 kg.

Assuming you catch the ball, what is your final velocity

75*v = 15*2 = 30/75 = 0.4 m/s

Assuming the ball bounces off you and travels in the opposite direction with a velocity of 12 m/s, what is your velocity

75*v = 2*3 , v = 0.08 m/s

A car of 1200 kg travels east at 24 m/s while a truck of 2200 kg travels north at 19 m/s. They collide and stick together.

What is the momentum in the system

2200*19 - 1200*24 = 13000 kgm/s

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