1. A tennis ball is initially dropped from a height of 180 m. After striking the ground, it rebounds (3/5)th of the height from which it has fallen. The total distance that the ball travels before it comes to rest is






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  • By: anil on 05 May 2019 02.39 am
    While going down the ball will first cover $$180$$m, then $$frac{180*3}{5}$$, then $$frac{180*3*3}{5*5}$$ and so on.
    After rebouncing the ball will cover $$frac{180*3}{5}$$, then $$frac{180*3*3}{5*5}$$ and so on
    Thus, there are 2 infinite G.Ps here one of $$180$$, $$frac{180*3}{5}$$, $$frac{180*3*3}{5*5}$$,......
    and other $$frac{180*3}{5}$$, $$frac{180*3*3}{5*5}$$,.........
    Total distance covered by the ball = Distance covered while going up + Distance covered while going down
    = $$frac{180}{1-frac{3}{5}} + frac{180*frac{3}{5}}{1-frac{3}{5}}$$ = $$720$$ m.
    Hence, option C is the correct answer.
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