Q. 204.2( 11 Votes )

An empty plastic box of mass m is found to accelerate up at the rate of g/6 when placed deep inside water. How much sand should be put inside the box so that it may accelerate down at the rate of g/6?

Answer :


Given:


Mass = m


Case I:


When it accelerates upward with acceleration =


Let B be the buoyant force.


Thus,




Case II:


When it accelerates downward with acceleration = after addition of sand of mass


Thus,






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