Jan and Len throw identical rocks off a tall building at the same time. The grou

Question

Jan and Len throw identical rocks off a tall building at the same time. The ground near the building is flat. Jan throws her rock straight downward. Len throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30. Len throws the rock with a speed twice that of Jan's rock. If air resistance is negligible, which rock hits the ground first? a.Len's rock hits first. b.They hit at the same time. c.Jan's rock hits first. d.It is impossible to know from the information given.

Explanation / Answer

Len throws his rock at an angle 30° below horizontal. This means the vertical component of its velocity is sin(30°) = 1/2 times its speed. Both rocks have the same initial downward velocity and therefore hit the ground at the same time.

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