GravitationMedium
Question
Gravitational potential difference between surface of a planet and a point situated at a height of 20m above its surface is 2 joule/kg. If gravitational field is uniform, then the work done in taking a 5kg body of height 4 meter above surface will be : -
Options
A.2J
B.20J
C.40J
D.10J
Solution
ᐃV = - Eg.dr
Because field is uniform
∴ 2 = - Eg.20 ⇒ E = -
; ᐃV = + 
[4] = 
work done in taking a 5 kg body to height 4 m = m (change in gravitational potential)
= 5
⇒ 2 J
Because field is uniform
∴ 2 = - Eg.20 ⇒ E = -
; ᐃV = + [4] = work done in taking a 5 kg body to height 4 m = m (change in gravitational potential)
= 5
⇒ 2 JCreate a free account to view solution
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