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Question

# Use the formula for momentum to find the momentum of each ball before and after the collision. Assume the mass of each ball is $0.4 \mathrm{~kg}$.

Solution

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The equation for the momentum is:

$p= m \cdot v$

where $m$ is the mass of the object and $v$ is its speed.

Let us start from the momentum for the blue ball before the collision.

\begin{align*} p_b&=m \cdot v_b\\\\ p_b&=0.4 \cdot 2\\\\ p_b&=\boxed{0.8 \ \text{kg} \cdot \dfrac{\text{m}}{\text{s}}} \end{align*}

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