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Q.

For a body travelling with uniform acceleration its final velocity (V) is v=16−7x, where x is the distance travelled by the body.  Then its initial velocity and acceleration are 

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a

8 ms−1, -4 ms−2

b

8 ms−1, 4 ms−2

c

4 ms−1, 3.5 ms−2

d

4 ms−1, -3.5 ms−2

answer is B.

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Detailed Solution

v2=16−7x

v2−16=−7x⇒v2−42=2−72x  .....(1)

Comparing eq(1) with v2-u2=2as

∴u=4 ms−1 and a =−7x2=−3.5 ms−2

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