The figure (Figure 1) shows the velocity of a solar-powered car as a function of

Question

The figure (Figure 1) shows the velocity of a solar-powered car as a function of time. The driver accelerates from a stop sign, cruises for 20s at a constant speed of 60 km/h, and then brakes to come to a stop 40s after leaving the stop sign.

1. Compute the average acceleration during the time interval t = 0 to t = 10s

2. Compute the average acceleration during the time interval t = 30s to t = 40s

3. Compute the average acceleration during the time interval t = 10s to y = 30s

4. Compute the average acceleration during the time interval t = 0 to t = 40s 5. What is the instantaneous acceleration at t = 20s?

Explanation / Answer

1. Compute the average acceleration during the time interval t = 0 to t = 10s

2. Compute the average acceleration during the time interval t = 30s to t = 40s

3. Compute the average acceleration during the time interval t = 10s to y = 30s

4. Compute the average acceleration during the time interval t = 0 to t = 40s 5. What is the instantaneous acceleration at t = 20s?

a) a = dv/dt = 16.667/10 = +1.667 m/s²

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