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Lokesh kumar Grade: 6
        
The kinetic energy needed to project a body of mass m from the earth surface (radius R) to infinity is
(a) mgR/2
(b) 2 mg /R
(c) mgR
(d) mgR/4
3 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
474 Points
										

(c) K.E. = ½ mv2e ­where ve = escape velocity = v2gR

? K.E = ½ m x 2gR = mgR
3 years ago
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