The figure shows the velocity of a solar-powered car as a function of time. The driver accelerates from a stop sign, cruises for 20 at a constant speed of 60 , and then brakes to come to a stop 40 after leaving the stop sign. What is the instantaneous acceleration at 35 seconds?

ok I understand its change in velocity divided by change in time. For some reason though I can’t get the right answer. The point at which it lies is on a negative linear slope. Can anyone help with the answer and explenation

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