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From classical mechanics to quantum field theory, momentum is the Universe's preferred language to describe motion. Learn here about momentum, its conservation, and how it captures our intuitions.

Two billiard balls of equal mass are rolled in such a way that their **velocities** have the same magnitude but are in opposite
directions.

Which of the following is an impossible outcome for the velocities of the billiard balls after a collision?

**Note**: *Collision may or may not be elastic.*

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You went to a park in winter to practice ice skating in a frozen lake, but because you're a beginner, you asked your friend to give you some **impulse** to start.

He applied a force of 150 Newtons to you during 1.2 seconds, after which you began moving with a constant velocity.

Another person is skating toward you with a velocity of 5 m/s. Unable to stop, you both collide and both stop moving.

Suppose that you have a mass of 60kg. Find the mass (in kilograms) of the person who collided with you.

**Details and assumptions**: Because the lake is frozen, the icy surface causes negligible friction.

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A body of mass \(m\) is moving along the \(x\)-axis with speed \(v\) when it collides with a body of mass \(2m\) initially at rest. After the collision, the first body comes to rest and the second body splits into two pieces of equal mass that move with equal velocities at equal angles off the \(x\)-axis \(0 < \theta < 90^\circ\), as shown in the figure.

Which of the following statements correctly describes the speeds of the two pieces?

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