railway RRB JE (CBT I + CBT II) Mock Test 2024 Engineering Mechanics Law of Motion

At any time t, the position of a particle moving along a straight line is prescribed by a relation: x = 3t2 - 6. From its initial position at t = 0, the particle will attain a velocity of 54 m/sec after:

1
15 sec
2
12 sec
3
8 sec
4
9 sec
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