Find the total displacement of the body from the following graph:A car travels at 54 km/h for first 20 s, 36 km/h for next 30 s and finally 18 km/h for next 10 s. find its average speed.
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speed =distance /time s×t=distance 1. 54×20=1080 2. 36×30=1080 3. 18×10= 180 av. speed=total displacement ÷total time 1080+1080+180÷60=39
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Applying s = ut
Displacement for 1st 20s = 54 * 20/3600 = 0.3 km
Displacement for next 30s = 36 * 30/3600 = 0.3 km
Displacement for next 10s = 18 * 10/3600 = 0.05km
∴ Average speed = Total displacement/Total time
= 0.65 ÷ 60/3600 = 39km/h
Displacement for 1st 20s = 54 * 20/3600 = 0.3 km
Displacement for next 30s = 36 * 30/3600 = 0.3 km
Displacement for next 10s = 18 * 10/3600 = 0.05km
∴ Average speed = Total displacement/Total time
= 0.65 ÷ 60/3600 = 39km/h
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