An Atwood machine with masses 3m and m is suspended inside a lift accelerating vertically downward with acceleration g/3. The magnitude of acceleration of 3m relative to the lift is:
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An Atwood machine with masses 3m and m is suspended inside a lift accelerating vertically downward with acceleration g/3. The magnitude of acceleration of 3m relative to the lift is:

G1 Physics · Accepted Answer

In the downward-accelerating lift frame, effective gravity is gₑff = g - g/3 = 2g/3. For an Atwood machine, relative acceleration = [(3m-m)/(3m+m)]gₑff = (2/4)(2g/3) = g/3.