You are on a train that is traveling at 3.0 m/s along a level straight track. Ve

Question

You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12 degree angle with the horizontal. As you face the window (0.827 m high, 2.04 m wide) in your compartment, the train is moving to the left, as the drawing indicates. The top edge of the wall first appears at window corner A and eventually disappears at window corner B. How much time passes between appearance and disappearance of the upper edge of the wall?

Explanation / Answer

The upper edge will disappear when tain has travelled a distance equal to the width of window and an addiional distance given by the base of triangle .= 2.04 + 0.827/ tan 12= 5.94 m apprx

time = 5.94/ 3= 1.98 sec apprx

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