JEE Advanced 2013 · Paper 1 · Physics Q18

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PhysicsInteger+4 / -1Question 18 of 60

A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed (in m s $^{-1}$ ) of the particle is zero, the speed (in m s $^{-1}$ ) after 5 s is

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Answer and worked solution

Official answer: 5

Constant power. $\frac12mv^2=Pt$ , so $v=\sqrt{\dfrac{2Pt}m}=\sqrt{\dfrac{2(0.5)(5)}{0.2}}=5$ m/s.

Answer: 5

Topics:Power Work-energy theorem

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JEE Advanced 2013 · Paper 1, Physics question 18