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Question

The velocity acquired by a body moving with uniform acceleration is 30ms1 in 2 seconds and 60ms1 in 4 seconds. The initial velocity is :-

A
zero
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B
2ms1
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C
4ms1
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D
10ms1
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Solution

The correct option is A zero
According to question
at t=2s , v=30m/s
at t=4s , v=60m/s
So,
acceleration = dvdt=603042=15m/s2
a=15m/s2
from 1st equation of motin is first case
v=u+at
30=u+15(2)
u=0m/s
Hence (A) option is correct answer


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