AIPMT | 2014KinematicsHard

Question

A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?

Options

A.
B.
C.
D.

Solution

a↓ mg - B = ma       .......(i)

B - (m - m0)g = (m - m )a       .......(ii)
Equation (i) + equation (ii)
⇒     mg - mg + m0g = ma + ma - m0a
⇒     m0 =

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