A 1-kg block initially at rest at the top of a 4-m incline with a slope of 45° begins to slide down the incline. The upper half of the incline is frictionless, while the lower half is rough, with a coefficient of kinetic friction μk = 0.3
a) How fast is the block moving midway along the incline, before entering the rough section?
b) How fast is the block moving at the bottom of the incline?
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