Question

What is the velocity of a 900 kg car initially moving at 30 m/s, just after it hits a 150 kg deer initially running at 12 m/s in the same direction? Assume the deer remains on the car.

Answer 1

Given the 900 kg car initially moving at 30 m/s just after it hits a 150 kg deer initially running at 12 m/s in the same direction.

`\begin{gathered} m_1=900kg \\ m_2=150kg \\ v_1=30\text{ m/s} \\ v_2=12\text{ m/s} \end{gathered}`

Hence, the velocity

`\begin{gathered} v=(900*30+150*12)/(900+150) \\ v=(27,000+1,800)/(1050) \\ v=(28,800)/(1050) \\ v=27.42\text{ m/s} \end{gathered}`

Thus, the given option a is correct.