A lift and its passengers have a total weight of 9000 N.
The lift is pulled upwards by a steel cable.
The Table shows the upward force from the cable during three stages of a journey. The lift moves upwards throughout stages A, B and C.
Table
| Stage | Time in s\text{s}s | Upward force from the cable in N\text{N}N |
|---|---|---|
| A | 0 to 2 | 9900 |
| B | 2 to 10 | 9000 |
| C | 10 to 12 | 8100 |
The gravitational field strength is 10 N/kg.
Calculate the mass of the lift and passengers.
Explain how the data show the motion of the lift during stage B.
Calculate the acceleration of the lift during stage A.
Describe the motion of the lift during stage C.
Give a reason for your answer.