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## Homework Statement

An alpha particle is emitted from a stationary nucleus at [tex]1.8 \times 10^7 ms^{-1}[/tex].The mass of the particle is [tex]4u[/tex] and that of the nucleus is [tex]212u[/tex]. (u is a unit of mass equal to [tex]1.66 \times 10^{-27}kg[/tex].)

(a) Find the recoil velocity of the nucleus.

(b) Explain how you know the direction of movement.

## Homework Equations

Momentum before collision = Momentum after collision

## The Attempt at a Solution

What does

**recoil velocity**mean?