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Question

A wooden block of mass 20 g is dropped from the top of the cliff 50 m high. Simultaneously a bullet of mass 20 g is fired from the foot of the cliff upwards with a velocity 25 ms1. The bullet and the wooden block will meet each other at a distance from top of the cliff : (g=10 ms2)

A
10 m
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B
20 m
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C
30 m
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D
40 m
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Solution

The correct option is B 20 m
Let they meet at a distance h from the top and it takes time t.



h=12gt2
h=5t2 (i)
50h=25t12.gt2
from equation (1) -
505t2=25t5t2
50=25t
t=2 sec
Putting this value of t=2 s in equation (i), we get
h=20 m

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