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  4. A lift moves vertically up with an acceleration a. Force exerted by a person of mass M on the floor of the lift is

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Q. A lift moves vertically up with an acceleration $a$. Force exerted by a person of mass $ M $ on the floor of the lift is

J & K CETJ & K CET 2017Laws of Motion

Solution:

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Using Newton’s second law,
$Ma=R-Mg$
$R=M(g+a)$
$\therefore $ Force exerted by a person
of mass $M$ on the floor of the
lift $=R=M(g+a)$