An automobile travels at a straight road at 40 km at 30 km/h . If then it continues in the the same direction for another 40 km at 60 km/h . (a) what is the average velocity of the car during the 80 km trip (Assume that it moves in the positive x direction) . (b) What is the average speed .
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Explanation:
[3pt] The first distance taken is: d_{1} = 40d
1
=40 km & at a speed : S_{1} = 30S
1
=30 km/h [3pt] The second distance taken is: d_{2} = 40d
2
=40 km & at a speed : S_{2} = 60S
2
=60 km/h [3pt]