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Q.

A stone is dropped from a height h. Simultaneously; another stone is thrown up from the ground which reaches a height 4h. The two stones cross each other after time

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a

h2g

b

h8g

c

8g h

d

2g h

answer is A.

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Detailed Solution

(a)For first stone u=0and

For second stoneu22g=4h⇒u2=8gh

Question Image

\u=8gh

Now, h1=12gt2

h2=8ght−12gt2

where, t =time to cross each other.

∵h1+h2=h

Þ12gt2+8ght−12gt2=hÞt=h8gh=h8g

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