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Q.

A body is moving along the +ve X-axis with uniform acceleration of –4ms2. Its velocity at x = 0 is 10 ms-1. The time taken by the body to reach a point at x = 12m is

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a

(1s, 2s)

b

(2s, 3s)

c

(4s, 8s)

d

(3s, 4s)

answer is A.

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Detailed Solution

We know, displacement of a particle with uniform acceleration is given by 

s=ut+12at2

12=10t-2t2

On solving we get t=2s , 3s.

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