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(A) The gravitational potential difference $\Delta V$ for a height $h_1 = 20\,m$ is given as $2\,J/kg$.Since the gravitational field $g$ is uniform,th

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$2$

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(A) The gravitational potential difference $\Delta V$ for a height $h_1 = 20\,m$ is given as $2\,J/kg$.Since the gravitational field $g$ is uniform,the potential difference is given by $\Delta V = g \cdot h$.Therefore,$g = \frac{\Delta V}{h_1} = \frac{2\,J/kg}{20\,m} = 0.1\,N/kg$ (or $m/s^2$).The work done $W$ in moving a body of mass $m = 5\,kg$ to a height $h_2 = 4\,m$ is given by $W = m \cdot g \cdot h_2$.Substituting the values: $W = 5\,kg 	imes 0.1\,N/kg 	imes 4\,m = 2\,J$.

Gravitational potential difference between the surface of a planet and a point situated at a height of $20\,m$ above its surface is $2\,J/kg$. If the gravitational field is uniform,then the work done in taking a $5\,kg$ body to a height of $4\,m$ above the surface will be ........ $J$.

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