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 the vertical, pointing forward. C Aim the cannon 30 degrees from the vertical, pointing forward. D Aim the cannon straight up. E Aim the cannon 45 degrees from vertical, pointing backward.

Explanation / Answer

in the case

the train and the cannon are moving with constant velocity = 60 mph

so for the cannon ball to land on top of the cannon the gunner should aim the cannon straight up

(D) will be the correct option

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