A person pushes a 14.5 kg lawnmower at constant speed with a force of 88 N directed along the handle, which is at an angle of 45o to the horizontal.
What is the force required to accelerate it from rest to 1.5 m/s in 2.5 seconds?
You know the pushing force for constant velocity, so the horizontal component of the pushing force must be friction. Find that.
Solve for the net force, knowing mass, acceleration, and the force of friction.