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Question

A ball is dropped from the top of a tower. Another ball is thrown up vertically with a velocity of 20 m/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=1.5 sec
H=30 m

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