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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
A boy having a mass equal to $40$ kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator$(g = 9.8\,metres/{\sec ^2})$
  • A
    Stands still
  • B
    Moves downward at a constant velocity of $4$ metres/sec
  • C
    Accelerates downward with an acceleration equal to $4\,metres/{\sec ^2}$
  • ✓
    Accelerates upward with an acceleration equal to $4\,metres/{\sec ^2}$
✓

Answer

Correct option: D.
Accelerates upward with an acceleration equal to $4\,metres/{\sec ^2}$
d
(d) A boy having mass equal to $40kg$ is standing in an elevator. the force felt by the feet of the boy will greater when the elevator accelerates upwards with an acceleration equal to $4 \mathrm{m} / \mathrm{sec}^{2}$

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