A train moves at constant velocity of 60 mph. A cannon is stationed on a flatcar

Question

A train moves at constant velocity of 60 mph. A cannon is stationed on a flatcar moving with the train. The cannon has a muzzle velocity of 120 mph. If the gunner wishes for the cannon ball to land on top of the cannon, she should: (ignore air resistance)



A. Aim the cannon 30 degrees from the vertical, pointing backward.



B. Aim the cannon 45 degrees from vertical, pointing backward.



C. Aim the cannon 30 degrees from the vertical, pointing forward.



D. Aim the cannon straight up.



E. Aim the cannon 45 degrees from the vertical, pointing forward

Explanation / Answer

In the frame of the train, the cannon is at rest. So if the gunner points the cannon straight up, it will land on top of the cannon in the train's frame. Hence the answer is

D. Aim the cannon straight up.

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