A ping pong ball is dropped from a 45 metres high multi-storey building. The ball bounces back three fifth of the distance each time before coming to rest. The total distance traversed by the ball is:
Explanation:
The distance traversed by the ball is
45 + 2 × 35(45) + 2 × 3535(45) + 2 × 353535(45) +
= 45 + 2 × 4535+352+353+...
= 45 + 2 × 45351-35
= 180 m
Hence, option (b).
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