mechanics
posted by chibuzor .
a car moved at 15m/s for two minutes.after which it moved at 18m/s for 45secods.calculate the average velocity of the car?

Divide the total distance travelled by the total elapsed time (120 + 45 seconds). Time should be in seconds for the calculation.
Vaverage = [(15*120)+(18*45)]/165
= 15.82 m/s