A block accelerates down a slope. The upper portion of the slope is smooth and the lower portion ...

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A block accelerates down a slope. The upper portion of the slope is smooth and the lower portion is rough. On the lower portion
a. the speed of the block may increase, decrease or remain the same.
b. the acceleration of the block reduces
c. the mass of the block reduces
i) (a) only
ii) (a) and (b) only
iii) (b) and (c) only
iv) (a) (b) and (c)

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