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Q.

Escape velocity of a body of 1 kg mass from the surface of a planet is 100 m/sec. Gravitational potential energy of the body on the surface of the planet is

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a

$- 5000 J$

b

$- 1000 J$

c

$- 2400 J$

d

$5000 J$

answer is A.

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Detailed Solution

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$pE = - (\frac{1}{2} {mv}_{e}^{2}) = - \frac{1}{2} (1) X (100)^{2} = - \frac{10000}{2} = - 5000 J$

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Escape velocity of a body of 1 kg mass from the surface of a planet is 100 m/sec. Gravitational potential energy of the body on the surface of the planet is