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Position of an ant (S in metres) moving in Y-Z plane is given by S = 2t 2 j ˆ + 5 k ˆ (where t is in second). The magnitude and direction of velocity of the ant at t = 1 s will be :

1. 4 m/s in y-direction
2. 9 m/s in z-direction
3. 16 m/s in y-direction
4. 4 m/s in x-direction

Correct answer: 4 m/s in y-direction

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