1.

A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocityfor that planet. The maximum height attained by the body is :

Answer»

`R//2`
`R//3`
`R//4`
`R//5`

Solution :K.E. = change in gravitational potential energy.
`(1)/(m) ((V_(e))/(2))^(2)=(GMM)/(R+H)+(GMm)/(R )`
`(1)/(2) m ((sqrt(2GM//R))/(2))^(2)=(-GMm)/(R+h)+(GMm)/(R )`
Thus gives `h=(R )/(3)`
Correct CHOICE is (b).


Discussion

No Comment Found

Related InterviewSolutions