1.

A car travels at a velocity of 80 km/h during the first half of the runningtime and at 40 km/h during the other half. Find a) average velocity of thecar b) average speed of the car. (AC)

Answer»

For first half, distance=v1t/2.........for second half, distance=v2t/2Average speed=v1t/2+v2t/2 the whole divided by t/2+t/2

=v1t+v2t/2/t =v1+v2/2 80+40/2 = 60 km/h



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