Question

a car increases its speed from 20 km\h to 50 km\h in 10 seconds. what is its acceleration? (economics class 9th)

Answer 1

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Answer 2

acceleration is change in velocity per unit time
a = (v2-v1)/(t2-t1)
v2-v1 = 30 kmph
= 30×5/18 m/s 
= 25/3 m/s
t2-t1 = 10s
a= 25/(3×10) = 5/6 m/s^2