a body of mass 20kg slides down on a plane inclined of 30 degree to the horizontal. if a constant resisting force of 40N act on the body, it's a acceleration down the plane is?
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weight = m g = 20 * 9.81 = 106 Newtons
weight component down slope = m g sin 30 = 53 N
53 - 40 = 13 N
a = F/m = 13 / 20