What incline? You said it was on a horizontal surface. Is there a transition from horizontal to 15 degree incline?
I suggest an energy approach the problem
A 0.50-kg block rests on a horizontal, frictionless surface, it is pressed against a light spring having a spring constant of k = 800 N/m, with an initial compression of 2.0 cm. To what height h does the block rise when moving up the incline? what would be the h if the coefficient of the kinetic friction is 0.1 and the angle is 15 degrees ?
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