escape vel. doubt

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find the min. velocity with which an object must be projected horizontally so that it doesen't returns back to the surface

acc to this link{ques c]}, ans shud be root [gr]
http://www.targetiit.com/iit-jee-forum/posts/interesting-kinematics-17278.html

but i believe it shud be root [2gr] only,

by conservation of energy{ as theres no role of angle of projection in it}

please confirm

#Physics #Mechanics

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4 Answers

sagnik sarkar ·2011-05-05 22:06:23

No seoni < plays a role here.At the moment the projectile turns back its velocity is not zero!! We need to apply both conservation of energy and angular momentum...

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seoni ·2011-05-05 22:27:03

thanks for replying...
but then we'll have 2 equations, & 3 variables( initial V, final V, final _l_ distance)

where am i wrong... please tell..

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seoni ·2011-05-20 09:12:06

please tell.

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Lokesh Verma ·2011-05-22 00:55:51

think of it in terms of graviational potential energy...

that will be much easier..

There you will not have to worry about horizontal/. vertical speed...

also you will not have to worry about changing gravitational field...

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escape vel. doubt

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