Question

A man pulls a box with a rope parallel to the ground. He pulls the box 100.0 m and does 5,000.0 J of work. What was the mass of the box?

0.5 kg

5 kg-my answer

50 kg

500 kg

Answer 1

Work = force times distance, units of N.m

5000 = F * 100

50N = F

N = mass * m^2/s^2 .... can we assume thats mg?

50/abt10 = 5 sounds right to me ..... but its a little hazy

Answer 2

Work = Force * Distance
\[Force = \frac{ 5000 Joules }{ 100m } = 50 Newton\]
Force = Mass * Gravity
\[Mass = \frac{ Force }{ Gravitational-acceleration } = \frac{ 50 Newtons }{ 9.81\frac{ m }{ s^2 } } = 5.0968 kg\]

So 5 kg would be correct.