A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 4.0 m above the ground. What is the mass of the box?

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## Answers (1)

Let E = the energy (work done) = 350 J

Let m = the mass

Let g = the acceleration due to gravity = 9.8 m/s²

Let h = the height = 4 m

E = m(g)(h)

m = 350 J/{9.8 m/s²(4 m)

m = 8.93 kg