13 A rock is dropped from the top of a 45 -meter tower

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

13 A rock is dropped from the top of a 45 -meter tower, and at the same time a ball is thrown from the top of the tower in a horizontal direction. Air resistance is negligible. The ball and the rock hit the level ground a distance of 30 meters apart. The horizontal velocity of the ball thrown was most nearly (A) 5 m/s5 \mathrm{~m} / \mathrm{s} (B) 10 m/s10 \mathrm{~m} / \mathrm{s} (C) 14.1 m/s14.1 \mathrm{~m} / \mathrm{s} (D) 20 m/s20 \mathrm{~m} / \mathrm{s} (E) 28.3 m/s28.3 \mathrm{~m} / \mathrm{s}

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