Bob and Biff Throw Identical Rocks Off a Tall Building

Bob and Biff throw identical rocks off a tall building at the same time.Bob throws his rock straight downward.Biff throws his rock downward and outward such that the angle between the initial velocity of the rock and the horizon is 30 degrees.Biff throws the rock with a speed twice that of Bob's rock.Which rock hits the ground first (assume the ground near the building is flat) ?

A) They hit at the same time.
B) Bob's rock
C) Biff's rock
D) Impossible to determine

Correct Answer:

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