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## Homework Statement

A block A of mass m travelling with speed v collides head-on with a stationary body B of mass 2m. The two bodies stick together. Calculate the impulse exerted by body B on body A during the collision.

## Homework Equations

## J = p_{final} - p_{initial} ##

## p_{initial} = p_{final} ##

## The Attempt at a Solution

I am not sure if this is correct. First I considered the system of the two blocks to calculate v':

mv + 0 = 3mv' -> v' = v/3

Then I calculated the initial and final momentum of block B on A using v' for final velocity:

## p_f - p_i = 2mv/3 - 0 = 2mv/3 ##

But I don't feel confident in the answer.