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Homework Help: physics

Posted by Anonymous on Thursday, November 29, 2012 at 11:35pm.

An 85.7 N box of clothes is pulled 26.2 m up
a 31.7
◦
ramp by a force of 112 N that points
along the ramp.
The acceleration of gravity is 9.81 m/s
2
.
If the coefficient of kinetic friction between
the box and ramp is 0.24, calculate the change
in the box’s kinetic energy.
Answer in units of J

• physics - Elena, Friday, November 30, 2012 at 3:07am

  ΔKE=ΔPE +W(fr)= m•g•s•sinα+μ•m•g•s•cosα=
  =m•g•s(sinα+μ•cosα)
  

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