A Person Pushes a lawn Mower. Physics question Need

[alexparker]

A Person Pushes a lawnmower of mass 20kg at a constant Speed with a force of 100N directed along the handle, which is at 35 Degrees to the horizontal



A) What is the horizontal Retarding force on the mower? I have already done this but can you please explain what Horizontal Retarding Force Is

B) What is the Normal Force by the ground on the mower?

C) What force must the person exert on the lawnmower in order to give it a velocity of 2.0m/s in 2.5 seconds? It doesn't say the initial speed, so should i assume it is from rest?

 

[rock.freak667]

There is some sort of resistive force the person pushing must overcome before the lawnmower can move. Though does the question mean at constant velocity or speed?

 

[jegues]

B) What is the Normal Force by the ground on the mower?

The mower isn't going to be moving at all along the vertical axis so the normal force and the vertical component of the applied force are going to cancel.

C) What force must the person exert on the lawnmower in order to give it a velocity of 2.0m/s in 2.5 seconds? It doesn't say the initial speed, so should i assume it is from rest?

I think it's safe to make that assumption.