The figure snows the velocity of a solar-powered car as a function of time. The

Question

The figure snows 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 kin/h, and then brakes to come to a stop 40 s after leaving the stop sign. Compute the average acceleration during the time interval t = 10s to t = 30s. Express your answer using two significant figures. Compute the average acceleration during the time interval t = 0 to t = 40s. Express your answer using two significant figures. What is the instantaneous acceleration at t = 20s? Express your answer using two significant figures. What is the instantaneous acceleration at t = 35s? Express your answer using two significant figures.

Explanation / Answer

Part C

a = dV/dt

Since Velocity is constant from t = 10 to t =30s, there is no acceleration.

a = 0

Part D

Avg Acc = V/t = 0/40 = 0

Part E

Ins Acc = dV/dt = 0 as no change in velocity

Part F

Ins Acc = dV/dt = Slope of the line = (0-60)  / (40-30) = -6 ms-2

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