Q.

A man throws balls with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the balls thrown so that more than two balls are in the sky at any time? (given g=9.8m/s2)

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a

more than 19.6ms−1

b

At least 9.8m/s

c

Any speed less than19.6m/s

d

Only with speed 19.6ms−1

answer is A.

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Detailed Solution

Interval of ball thrown=2sec. If we want that more than two balls remain in air , then time of flight of first ball must be greater that 4 seconds i.e..  T>4s (or)2ug>4(or)u>4×9.82(or)u>19.6m/s
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A man throws balls with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the balls thrown so that more than two balls are in the sky at any time? (given g=9.8m/s2)