A train is traveling with a uniform velocity of 2i^−j^+4k^ m s-1 on a level track. The engine has to exert a force of (i^−3j^+2k^) N to overcome friction. The power of the engine is

Question

A train is traveling with a uniform velocity of

2 \hat{i} - \hat{j} + 4 \hat{k} m s^{- 1}

on a level track. The engine has to exert a force of

(\hat{i} - 3 \hat{j} + 2 \hat{k}) N

to overcome friction. The power of the engine is

7 W

10 W

13 W

15 W

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