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An object of mass 1000 g experiences a time dependent force ) j ˆ t 3 i ˆ t 2 ( F 2 + = N. The power generated by the force at time t is:

1. (2t 2 + 3t 3 ) W
2. (3t 3 + 5t 5 ) W
3. (2t 2 + 18t 3 ) W
4. (2t 3 + 3t 5 ) W

Correct answer: (2t 3 + 3t 5 ) W

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