A person pushes a 14.0 kilogram lawn mower at constant speed with a force of 85.0 Newton directed along the handle, which is at an angle of θ= 47.0 degree to the horizontal.
Determine the force the person must exert on the lawn mower to accelerate it from rest to 1.6 m/s in 2.0 s (assuming the retarding force to be 57.97 (in the horizontal direction)).