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**1. Homework Statement**

An 85.8 N box of clothes is pulled 24.5 m up

a 21.1◦ ramp by a force of 118 N that points

along the ramp.

The acceleration of gravity is 9.81 m/s2 .

If the coefficient of kinetic friction between

the box and ramp is 0.26, calculate the change

in the box’s kinetic energy. Answer in units

of J.

**2. Homework Equations**

KE=1/2mv^2 ,Vf^2=Vi^2+2(a)(d),

PE= m g h

**3. The Attempt at a Solution**

I tried to do a method told to me by a friend who said to use the formula

F d - m g d ( sin Θ - µ cos Θ) = 1/2 m v² but when i tried it it turned it to be wrong at least the way i tried it maybe it was a calculation error. Please help with concept and formula