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A body of mass 20kg lies on a horizontal floor and is acted on by...

A body of mass 20kg lies on a horizontal floor and is acted on by constant forces of magnitude 100N and mN in the directions 180° and 060° respectively, where m is constant. The body begins to move in the direction 090°. If there is also a resistance of 1/5N per kg to the motion,
A. Calculate the value of m and the magnitude of the resultant force acting on the body.
B. Find the acceleration of the body?

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