A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, it speed is 4 m/s. But 3 seconds later , at the bottom of the slope, it's speed is 22 m/s. What is the average acceleration?
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Acceleration: The rate of change of velocity per unit of time.
a=v-u/t
=(22-4)/3
=6m/s^2.
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