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(D) Let $m$ be the mass of the monkey and $g$ be the acceleration due to gravity.The reading of the spring balance corresponds to the normal force $N$

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The elevator is accelerated upwards

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(D) Let $m$ be the mass of the monkey and $g$ be the acceleration due to gravity.The reading of the spring balance corresponds to the normal force $N$ exerted by the pan on the monkey.When the elevator is accelerated upwards with an acceleration $a$,the equation of motion for the monkey is $N - mg = ma$.Thus,$N = m(g + a)$.When the elevator is stationary,$N = mg$.When the elevator is accelerated downwards with acceleration $a$,$N = m(g - a)$.When the elevator falls freely,$a = g$,so $N = m(g - g) = 0$.Comparing these cases,the reading $N$ is maximum when the elevator is accelerated upwards.

$A$ monkey is sitting on the pan of a spring balance which is placed on an elevator. The maximum reading of the spring balance will be when

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