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(A) A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. Find his acceleration? Is this acceleration higher than that of a car which accelerates from 0 to 30 m/s in 8 seconds?

(B) A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. Find its average acceleration?

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