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swede5670
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Homework Statement
A person pushes a 16.0 kg lawn mower at constant speed with a force of 75.0 N directed along the handle, which is at an angle of θ = 40.0° to the horizontal.
Calculate the normal force exerted vertically upward on the mower by the ground.
Calculate the force the person must exert on the lawn mower to accelerate it from rest to 1.1 m/s in 2.0 seconds (assuming the same retarding force).
Homework Equations
Fnet = MA
The Attempt at a Solution
To try and solve the first problem I made a free body diagram and then divided the downwards push into horizontal and vertical components so that I could create a triangle. With 75N as the hypotenuse and 40degrees as the angle. I used sine so that I could find the downwards force being exerted by the person. x = sine(40) x 75 which comes out to 55.8834N. I'm not sure what I need to do to figure out the vertical force, wouldn't it just be 55.88? I know its not, but that's what seems logical to me. Do I just need to add the force of gravity pulling down?
On the second one I am completely lost, so that's where I'd like the most help.
Thanks
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