A mass of 75kg is placed on a lift. Find the force exerted by the floor of the lift on the mass when the lift is moving up with constant velocity. \([g = 9.8ms^{-2}]\)
- 750N
- 745N
-
735N
- 98N
The correct answer is: C
Explanation
Net force = Upward force - weight
\(ma = F - mg\)
With constant velocity, acceleration = 0, therefore, ma = 0
\(\therefore F = mg = 75 \times 9.8 = 735N\).