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Q.

The velocity of a particle at an instant is 10 ms-1. After 3 s its velocity will become 16 ms-1. The velocity at 2 s, before the given instant would have been:

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a

6 ms-1

b

4 ms-1

c

2 ms-1

d

1 ms-1

answer is A.

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Detailed Solution

For 2nd part 10 m/s is initial velocity.Hence 16=10+a(3)⇒ a = 2m/s2For 1st part 10 m/s is final velocity10 = u+2 x 2u = 6m/s

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The velocity of a particle at an instant is 10 ms-1. After 3 s its velocity will become 16 ms-1. The velocity at 2 s, before the given instant would have been: