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A person pushes a 15.0 kg lawn mower at constant speed with a force of 89.0...

A person pushes a 15.0 kg lawn mower at constant speed with a force of 89.0 N directed along the handle, which is at an angle of 45.0∘ to the horizontal.

a. Calculate the horizontal friction force on the mower.

Express your answer to three significant figures and include the appropriate units.

b. Calculate the normal force exerted vertically upward on the mower by the ground.

Express your answer to three significant figures and include the appropriate units.

c. What force must the person exert on the lawn mower to accelerate it from rest to 1.3 m/s

in 2.5 seconds, assuming the same friction force?

Express your answer to three significant figures and include the appropriate units.

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