A car covered the first 400m distance with a speed of 8m/s the next 1200m with a speed 12m /s and the last 360m with a speed of 12m/s calculate the average speed of the car
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Explanation:
average speed=total distance/total time
total distance =400+1200+360
= 1960
time= d/s
avg speed=td/d1/s1+d2/s2+d3/s3
=1960/400/8+1200/12+360/12
=1960/50+100+30
=1960/180
=18.88m/s
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