NEET | 2016Basic Maths and Units and DimensionsHard

Question

A body of mass 1 kg begins to move under the action of a time dependent force F→=(2t i^ + 3t2 j^), where i^ and j^ are unit vectors along x and y axis. What power will be developed by the force at the time t ?

Options

A.

(2t2 + 3t3)W

B.

(2t2 + 4t4)W

C.

(2t3 + 3t4)W

D.

(2t3 + 3t5)W

Solution

a→=2ti^+ 3t2j^
V→=2t2i^+33t2j^
F→=2ti^ + 3t2j^
P=F→.V→=2t3 +3t5

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