If g is the acceleration due to gravity at the earth’s surface and r is the radius of the earth, the escape velocity for the body to escape out of earth’s gravitational field is
(a) gr (b) √2gr
(c) g/r (d) r/g
Answer: b
(5)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)