Answer: (1) x < 0, v < 0, a > 0
- Displacement = Downward (x<0)
- Velocity = Downward (v<0)
- Acceleration = In direction of velocity (a>0)
Because the lift is coming from the downward direction, the displacement will be negative. We must determine if the motion is retarding or accelerating. We know that the displacement will be negative due to the downward motion. When the lift reaches the fourth floor, it is about to stop; hence, motion is low; thus, x<0 and a>0. Because the displacement is negative, the velocity is also negative, i.e. v<0.