A 2 kg mass is lifted vertically by 3 meters at a constant speed. How much work is done by the lifting force? (Assume g = 9.8 m/s^2)

✓ Correct Answer: Option C

Work done by the lifting force is W = Fd. Since the speed is constant, the lifting force F equals the gravitational force mg. So, W = mgd = (2 kg)(9.8 m/s^2)(3 m) = 58.8 J.