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

PhysicsW.E.P.MiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

The displacement $x$ of a body of mass $1 kg$ on a horizontal smooth surface as a function of time t is given by $x = \frac{t^{4}}{4}$ . The work done in the first second is

Options:

Answer:

Solution:

$v = \frac{dx}{dt} = \frac{1}{4} \times 4 t^{3} = t^{3} = {1 m s}^{- 1}$

Work done = Change in K.E.

$= \frac{1}{2} \times 1 \times 1 - \frac{1}{2} \times 1 \times 0$

$= \frac{1}{2} J$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:W.E.P.Subtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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