Choose the best answer to the following.
Consider a ball that picks up a speed of 2 m/s each second when it rolls from rest down an inclined plane. If the ball takes 5 seconds to reach the bottom, its speed at the bottom will be
(a) 5 m/s.
(b) 7.5 m/s.
(c) 10 m/s.
(d) None of the above.
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