A parcel of mass 5 kg is projected with speed 8 ms−1 up a line of greatest slope of a fixed rough inclined ramp.
The ramp is inclined at angle to the horizontal, where .
The parcel is projected from the point A on the ramp and comes to instantaneous rest at the point B on the ramp, where AB = 14 m.
The coefficient of friction between the parcel and the ramp is .
In a model of the parcel’s motion, the parcel is treated as a particle.
Use the work-energy principle to find the value of .
Suggest one way in which the model could be refined to make it more realistic.
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