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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.PowerEasy2 minPYQ_2021

PhysicsEasysingle choice

A car of mass ' $m$ ' moving with velocity ' $u$ ' on a straight road in a straight line, doubles its velocity in time $t$ . the power delivered by the engine of a car for doubling the velocity is

Options:

Answer:

Solution:

Initial kinetic energy $k_{1} = \frac{1}{2} mu^{2}$ Final kinetic energy $k_{2} = \frac{1}{2} mu_{2}^{2} = \frac{1}{2} m (2 u)^{2} = \frac{1}{2} (4 mu^{2})$ $∴ k_{2} - k_{1} = \frac{3}{2} mu^{2}$ Change in K.E. is work done Power, $P = \frac{workdone}{t} = \frac{3 mu ^{2}}{2 t}$

Stream:MHT_CETSubject:PhysicsTopic:W.E.P.Subtopic:Power

⏱ 2mℹ️ Source: PYQ_2021

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