Physics Problem: A boy pulls a 30.0kg box on a horizontal surface with a force that makes an angle 30degrees the horizontal. If the coefficient of static friction and kinetic friction between the box and the surface are 0.45 and 0.35 respectively, find:
a.) the force that will start the box to move
b.) the acceleration of the box of the boy maintains the same force that moves the box

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what is the exact formula for letter a and b ??

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