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  4. The normal reaction on a body placed in a lift moving up with constant acceleration 2 m s- 1 is 120 N . Mass of the body is (Take g=10 m s- 2 )

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Q. The normal reaction on a body placed in a lift moving up with constant acceleration $2 \, m \, s^{- 1}$ is $120 \, N$ . Mass of the body is (Take $g=10 \, m \, s^{- 2}$ )

NTA AbhyasNTA Abhyas 2020Laws of Motion

Solution:

From force diagram shown in figure,

Solution
$N-mg=ma_{0}$
or $120-mg=2m$
$\therefore m=\frac{120}{g + 2}=\frac{120}{10 + 2}$
$=10$ kg