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) :
Answer & explanation
Correct answer: option 3
mgh = [\(\frac{1}{2}mv_o^2 + mgh] x \frac{50}{100}\)
h = 20 m
vo = 20 m/s