an object travels at a speed of 60 m/s for first 20 secs,then at a speed of 50m/s for 15 secs and the 60 m/s for 10s.what is the average speed of the object?
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Step-by-step explanation:
s1 = 60 * 20 = 1200m
s2 = 50* 15 =750m
s3= 60*10 = 600m
average speed = total distance / total time
=1200+750+600/20+10+15
= 2550/45
= 56.67m/s
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