1. Two cars, A and B, leave together at the same time and travel on the same road heading east. Their speed graphs are shown below. (a) Which car's acceleration is greater at 30 seconds? Ans. (b) Which car's speed is greater at 50 seconds (where the curves intersect)? Ans. (c) Which car has traveled the furthest (is in front) after 90 seconds? Ans. The position after $t$ sec. of a particle moving on a line is given: (a) Estimate the particle's speed $\frac{d s}{d t}$ at: $t = 4$ $t = 8$ (b) Give the average speed $\frac{? s}{? t}$ over the interval $0 ? t ? 8$ :

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1. Two cars, A and B, leave together at the same time and travel on the same road heading east. Their speed graphs are shown below. (a) Which car's acceleration is greater at 30 seconds? Ans. (b) Which car's speed is greater at 50 seconds (where the curves intersect)? Ans. (c) Which car has traveled the furthest (is in front) after 90 seconds? Ans. The position after

t

sec. of a particle moving on a line is given: (a) Estimate the particle's speed

\frac{d s}{d t}

at:

t = 4

t = 8

(b) Give the average speed

\frac{? s}{? t}

over the interval

0 ? t ? 8

:

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