Question

A lift is freely falling from 8th floor and is just about to stop at 4th floor. Taking ground floor as origin and positive direction upwards for displacement, velocity, acceleration.

Answer 1

Answer:

According tot he problem the falling direction of the lift is downward.

Now the change in velocity with a particular rate of time is acceleration.

Acceleration has the same direction of change in velocity.

Now as the lift is coming downward therefore the displacement, s is negative.

As displacement is in negative direction the velocity is also v<0

Now when the lift reached at 4th floor its velocity decreased with time

Therefore the motion is also retarding.

Therefore s<0 and acceleration, a>0