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A frictionless cart starts at rest and accelerates down a straight incline of angle $\theta = 30.0 ^o$ relative to the horizontal. The cart has mass $3.0 kg$.
How much force does the cart exert on the incline?
$14.7 \ N$
$17.0 \ N$
$25.5 \ N$
$29.4 \ N$
It depends on the speed of the cart at any given point in time.