Questions
A body is projected upwards with a velocity of 4 x 11.2km / s from the surface of earth. What will be the velocity of the body when it escapes the gravitational pull of earth ?
a
11.2km / s
b
2 x 11.2km/s
c
3 x 11.2km/s
d
15×11⋅2km/s
detailed solution
Correct option is D
Initial kinetic energy=12mv2=12m(4×11⋅2)2=16×12mve2Final kinetic energy should be 15×12mve2Hence 12mv′2=15×12mve2v′2=15×ve2 or v′=15⋅ve∴v′=15×11⋅2km/sTalk to our academic expert!
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