Q.

The escape velocity from earth is  ves. A body is projected with velocity 2ves with what constant velocity will it move in the inter planetary space

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a

ves

b

3ves

c

3ves

d

5ves

answer is C.

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Detailed Solution

Velocity of body in inter planetary space  v'=v2−ves2where  ves= escape velocity and              v = velocity of projection∴ v′=2ves2−ves2=3ves2⇒v′=3ves
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The escape velocity from earth is  ves. A body is projected with velocity 2ves with what constant velocity will it move in the inter planetary space