A gardener pushes a lawnmower of mass 18kg at a constant speed. To do this requires a force P of 80N directed along the handle, which is at an angle of 40°to the horizontal.
a) Calculate the horizontal frictional force
b) If this frictional force were constant, what force, applied along the handle, would accelerate the mower from rest to 1.2m/s in 2.0s?
a) "f=P\\cos\\theta=61.3\\text{ N}."
b) By Newton's second law:
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