A body of mass 1 kg begins to move under the action of a time dependent force F = (2t , i + 3t 2 , j) N , where i and j are unit vectors along x and y axis. What power will be developed by the force at the time t ?

1. A. (2t 2 + 3t 3) W
2. B. (2t 2 + 4t 4) W
3. C. (2t 3 + 3t 4) W
4. D. (2t 3 + 3t 5) W

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