A ball is dropped from the top of a tower. Another ball is thrown up vertically with a velocity of 20m/s from the ground level at the same instant and meets the first ball after 1.5 seconds. Height of the tower is
A
20 m
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B
30 m
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C
40 m
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D
50 m
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Solution
The correct option is D 30 m For A: sA=12gt2 For B: sB=20(t)−12gt2 sA+sB=20t=H t=1.5sec ⇒H=30m