A mass of 75kg is placed on a lift. Find the force exerted by the...
FURTHER MATHEMATICS
WAEC 2015
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. \([g = 9.8ms^{-2}]\)
- A. 750N
- B. 745N
- C. 735N
- D. 98N
Correct Answer: C. 735N
Explanation
Net force = Upward force - weight
\(ma = F - mg\)
With constant velocity, acceleration = 0, therefore, ma = 0
\(\therefore F = mg = 75 \times 9.8 = 735N\).
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