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A ball is thrown vertically downwards from a height of 20 m with an initial velocity 2 0 v . It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v0 is (Take g = 10 ms–2) : |
10 m/s 14 m/s 20 m/s 28 m/s |
20 m/s |
mgh = [\(\frac{1}{2}mv_o^2 + mgh] x \frac{50}{100}\) h = 20 m vo = 20 m/s |
