A car travelling at 20km/h, it speeds up to 60km/h in 6 seconds. What is its acceleration?
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u=20km/hr=20×5/18=50/9m/s
v=60km/hr=60×5/18=150/9m/s
t=6sec
a=v-u/t
=(150/9-50/9)/6m/s^2
=100/9÷6m/s^2
=100/54×18/5km/h^2
=6.67km/h^2
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