Consider an elevator moving downwards with an acceleration a. The force exerted by a passenger of mass m on the floor of the elevator:

m a

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m a - m g

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m g - m a

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m g + m a

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Solution

The correct option is B $m g - m a$
the force exerted by the man on the floor is the normal and its reaction is being exerted on the man itself
Applying the first law of motion
$M g - N = M a$
$N = M (g - a)$

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Consider an elevator moving downwards with an acceleration a. The force exerted by a passenger of mass m on the floor of the elevator:

The correct option is B mg−mathe force exerted by the man on the floor is the normal and its reaction is being exerted on the man itselfApplying the first law of motion Mg−N=MaN=M(g−a)

The correct option is B $m g - m a$
the force exerted by the man on the floor is the normal and its reaction is being exerted on the man itself
Applying the first law of motion
$M g - N = M a$
$N = M (g - a)$