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

PhysicsW.E.P.MiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A machine which is $75 %$ efficient uses $12 J$ of energy in lifting up a $1 kg$ mass through a certain distance. The mass is then allowed to fall through, that distance. The velocity of the ball at the end of its fall is

Options:

Answer:

Solution:

Useful work $= \frac{75}{100} \times 12 J = 9 J$

Now, $\frac{1}{2} \times 1 \times v^{2} = 9$ or $v = \sqrt{18} m s^{- 1}$

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

⏱ 2mℹ️ Source: PYQ_2020

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