A man throws balls with same speed vertically upwards one after the other at an interval of 2 sec. What should be the speed of throw so that more than two balls are in air at any time(a) only with speed 19.6 m/s(b) more than 19.6 m/s(c) at least 9.8 m/s(d) any speed less then 19.6 m/s.
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Due to the gravitational force of the earth in the atmosphere level due to the newtons 3 Rd law
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