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 $\left(g=9.8\right.$ metres $\left./ sec ^2\right)$
- AStands still
- BMay be at rest or in uniform motion
- CAccelerates downward with an acceleration equal to 4 metres / $sec ^2$
- ✓Accelerates upward with an acceleration equal to 4 metres / $sec ^2$

