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A body of 10 kg is dropped from infinite...

A body of 10 kg is dropped from infinite height towards earth's surface. What will be its velocity just before touching the earth's surface. (Gravitational potential energy of the body at earth's surface is `6.25xx10^(8)` Joule).

A

22.4 km/sec

B

11.2 km/sec

C

6.4 km/sec

D

Infinite

Text Solution

Verified by Experts

The correct Answer is:
B
The gravitational potential energy is obtained as kinetic energy
`:. (1)/(2) mv^(2)= 6.25xx10^(8)`
`v = sqrt((2xx6.25xx10^(8))/(10))`
`implies v = 11.2` km/sec
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