Question

Question #3a861

Answer 1

Lift Accelerates Upwards

Explanation:

The situation when the lift is moving upwards With Acceleration `a`

When the lift moves upwards with acceleration `a` then its floor will push upwards on the body to give that the same acceleration also.

By Newton’s third law the body will therefore exert an equal and opposite reaction of force `ma` downwards on the floor.

The force of gravity apply force `mg` which is downwards.
The resultant force which the body exerts on the floor is, therefore,
`F=mg + ma = m (g + a)`