SOLUTION: <a href='http://postimage.org/' target='_blank'><img src='http://s28.postimg.org/k8oe5odx9/dddds.jpg' border='0' alt="dddds" /></a> I want to know ho to solve these 3 questions

Question 856062:
I want to know ho to solve these 3 questions please
thank you .
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
These are not algebra problems but rather physics problems.
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Q47: Gravity acts downwards. Resolve the force into components along the plane and normal to the plane. Along the plane,

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Q42:Look at the work done by the friction force. It equals the initial kinetic energy of the object.

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Q49: Since there is a friction force, set up a force balance down the plane.

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