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Question

A particle starts from a point with a velocity of +6 m/s and moves with an acceleration of 2 m/s2. After what time will the particle be at the starting point?

A
2 s
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B
6 s
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C
4 s
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D
5 s
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Solution

The correct option is B 6 s
We know that,

s=ut+12at2

0=6t+12(2)t2

6tt2=0

t(6t)=0

t=6 s

Hence, after 6 s particle will be at the starting point.

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