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# Momentum

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.

# Momentum 1D - Problem Solving

Two ice skaters of weights $$42\text{ kg}$$ and $$84\text{ kg}$$ push off against each other starting from a stationary position. If the $$42 \text{ kg}$$ skater acquires a velocity of $$6 \text{ m/s}$$ to the right, what speed does the $$84 \text{ kg}$$ skater acquire?

A $$10.0\text{ g}$$ bullet is fired from a rifle of mass $$4 \text{ kg} .$$ If the speed of the fired bullet is $$850 \text{ m/s},$$ what is the approximate recoil speed of the rifle?

Two objects of weights $$2 \text{ kg}$$ and $$3 \text{ kg}$$ slide together with equal velocities of $$9.0 \text{ m/s},$$ and then they break apart. If the final velocity of the $$3 \text{ kg}$$ object is $$10.0 \text{ m/s},$$ what is the magnitude of the final velocity of the $$2 \text{ kg}$$ object?

A glider of mass $$100 \text{ g}$$ is moving along a horizontal straight air track at $$4 \text{ m/s}.$$ It then collides with a stationary glider of mass $$100 \text{ g}.$$ After the collision, the velocity of the first glider becomes $$2 \text{ m/s}$$ in the same direction as before. What is the velocity of the second glider?

An object $$m_1 (= 2 \text{ kg})$$ which moves with a velocity of $$15 \text{ m/s}$$ collides with a stationary object $$m_2 (= 8 \text{ kg}).$$ After the collision, they stick to each other and move together. Find the magnitude of velocity of both objects after the collision.

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