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PhysicsW.E.P.PowerEasy2 minPYQ_2020

PhysicsEasysingle choice

A body, starting from rest, is moved along a straight line by a machine delivering constant power. The distance moved by the body in time $t$ is proportional to

Options:

Answer:

Solution:

Power, $P = F v =$ constant

Or $m a (a t) = c o n s t a n t$

Or $a^{2} t = c o n s t a n t$

$\Rightarrow a \propto \frac{1}{\sqrt{t}}$ ....... (1)

Now, $S = \sqrt{2} a t^{2}$ $(∵ u = 0)$

$\Rightarrow S \propto a t^{2}$

$∴ S \propto \frac{t^{2}}{\sqrt{t}}$ [Using (1)]

$\Rightarrow S \propto t^{3 / 2}$

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

⏱ 2mℹ️ Source: PYQ_2020

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