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Mechanics

Blazing goIITian

Joined:	21 Dec 2007
Post:	1025

11 Sep 2008 11:30:07 IST

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315

kinematics relative acceleration

None

when a body A is projected upwards from ground

and another body B is dropped from a tall building

what is their relative accelraton????/

my approach

aAB = aA-aB

aAB=g-(-g)=2g but the answer is 0

arent we supposed to use sign convention here

and what about velocity are we supposed to apply sign convention for velocity

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Gaurav |spideyunlimited| Ragtah

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Joined: 16 Dec 2006

Posts: 3373

11 Sep 2008 11:53:19 IST

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Acceleration for both bodies is g downwards at all times. So relative acceleration is 0.

A relative = g - g = 0

Yes, you have to apply sign conventions for velocity if you're finding relative velocity.

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