Question

a 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in an auto service station. Lifting the more massive car requires _____ work

a. less b. the same c. twice as much d. four times as much

Plzzzzzzzz explain the your answer..thank you.God Bless

Answer 1

A 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in an auto service station. Lifting the more massive car requires ___ work

a. less b. the same c. twice as much d. four times as much

Solution:

$$A = mgh;$$ $$\frac{A1}{A2} = \frac{m1gh}{m2gh} = \frac{m1}{m2} = \frac{2400}{1200} = 2.$$

Answer: "C" (twice as much)