Gravitational potential difference between a point on surface of planet and another point 10 m above is 4 J / kg. Considering gravitational field to be uniform, how much work (in J ) is done by an external agent in moving a mass of 2.0 kg from the surface to a point 5.0 m above the surface slowly.

Question

Gravitational potential difference between a point on surface of planet and another point 10 m above is 4 J / kg. Considering gravitational field to be uniform, how much work (in J ) is done by an external agent in moving a mass of 2.0 kg from the surface to a point 5.0 m above the surface slowly. (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

W textext+Wg=4 K=0 W textext-m4 V=0 W textext =2 × (4/2)=4 J

Q. Gravitational potential difference between a point on surface of planet and another point 10m above is 4J/kg. Considering gravitational field to be uniform, how much work (in J ) is done by an external agent in moving a mass of 2.0kg from the surface to a point 5.0m above the surface slowly.

Wext​+Wg​=4K=0 Wext​−m4​V=0 Wext​=2×24​=4J

$W_{ext} + W_{g} = 4 K = 0$
$W_{ext} - m_{4} V = 0$
$W_{ext} = 2 \times \frac{4}{2} = 4 J$