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A body of mass 100 kg falls on the earth...

A body of mass 100 kg falls on the earth from infinity. Given radius of earth = 6400 km and `g=9.8 m//s^2`. Air friction may be neglected. Its velocity and energy on reaching the earth are:

A

8km/s and `3.2 xx 10^9 J`, respectively

B

Both infinity

C

11.2 km/s and `6.27 xx 10^9 J` respectively

D

11.2 km/s and `6272 J`, respectively

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