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Gravitational potential difference between a point on surface of planet and another point 10 m above is 4J/kg. Considering gravitational field to be uniform, how much work is done in moving a mass of 2kg from the surface to a point 5 m above the surface?

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The correct Answer is:
4J
`W_("ext")+W_(g)=4K = 0`
`W_("ext")-m_(4) V = 0`
Wext `= 2xx(4)/(2)=4J`
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