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Figure below shows the velocity of a solar-powered car as a function of time.

Figure below shows the velocity of a solar-powered car as a function of time. The driver accelerates from a stop sign, cruises for 20 s at a constant speed of 60 km/h, and then brakes to come to a stop 40 s after leaving the stop sign.
(a) Compute the average acceleration during the following time intervals:
(i) t = 0 to t = 10 s (ii) t = 30 s to t = 40 s (iii) t = 10 s to t = 30 s (iv) t = 0 to t = 40 s.
(b) What is the instantaneous acceleration at t = 20 s and at t = 35 s?

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