- #1

Jack_Straw

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## Homework Statement

To move a refrigerator of mass 210 kg into a house, a mover puts it on a dolly and covers the steps leading into the house with a wooden plank acting as a ramp. The plank is 8.5 m long and rises 2.4 m. The mover pulls the dolly with constant velocity and with a steady force 1200 N up the ramp. How much work does he perform? The acceleration of gravity is 9.8 m/s2. Answer in units of J.

## Homework Equations

W = F[tex]\vec{}[/tex] * S[tex]\vec{}[/tex]

## The Attempt at a Solution

if W = F[tex]\vec{}[/tex] * S[tex]\vec{}[/tex]

and S[tex]\vec{}[/tex] = Scos(angle)

_{F,S}

then W = 1200*8.4cos(0) = 10080J

Upon submitting my homework I'm told it is incorrect, but I can't see where I went wrong here.