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At any instant the velocity of a particle of mass 500 g is 1 2 ms ) j ˆ t 3 i ˆ t 2 ( − + . If the force acting on the particle at t = 1s is ) j ˆ x i ˆ ( + N. Then the value of x will be:

1. 3
2. 4
3. 2
4. 6

Correct answer: 3

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