A person gardening pushes a lawn of mower of mass 18 kg at a constant speed. To do this he requires a force of 80N directly along the handle, which is at an angle of 40 degrees to the horizontal.
a) Calculate the friction force on the mower.
b) If friction remains constant, what before, applied along the handle would accelerate the mower from rest to 1.2 ms -1 in 2.0 s