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Standard XII

Physics

Gravitational Potential Energy

A person brin...

Question

A person bring a mass of $1 k g$ from infinite to point $A$ . Initially the mass was at rest but is moves a speed of $2 m / s$ as it reaches to $A$ . The workdone by the person on mass is $- 3 J$ the gravitational potential at $A$ is

- 3 J / k g

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- 2 J / k g

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- 5 J / k g

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- 7 J / k g

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Solution

The correct option is D $- 5 J / k g$
$K . E_{f} = {1.2}^{2} / 2 = 2$
Work Energy Theorem,
$E_{f} - E_{i} = W$
$2 + P . E - 0 = - 3$
$P . E = m V = - 5$
$V = - 5$ since $m = 1$

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A person bring a mass of 1kg from infinite to point A. Initially the mass was at rest but is moves a speed of 2m/s as it reaches to A. The workdone by the person on mass is −3J the gravitational potential at A is

The correct option is D −5J/kgK.Ef=1.22/2=2Work Energy Theorem,Ef−Ei=W2+P.E−0=−3P.E=mV=−5V=−5 since m=1

A person bring a mass of $1 k g$ from infinite to point $A$ . Initially the mass was at rest but is moves a speed of $2 m / s$ as it reaches to $A$ . The workdone by the person on mass is $- 3 J$ the gravitational potential at $A$ is

The correct option is D $- 5 J / k g$
$K . E_{f} = {1.2}^{2} / 2 = 2$
Work Energy Theorem,
$E_{f} - E_{i} = W$
$2 + P . E - 0 = - 3$
$P . E = m V = - 5$
$V = - 5$ since $m = 1$