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Classical Mechanics
Level
1
A car increases its speed from 40 km/h to 60 km/h and a bike goes from 0 km/h to 20 km/h in the same time. Which has the greater acceleration?
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They're the same
The Car
The Bike
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1 solution
a =Δ v /t
a c a r = ( ( 6 0 − 4 0 ) k m / h ) / h = 2 0 k m / h 2
a b i k e = ( ( 2 0 − 0 ) k m / h ) / h = 2 0 k m / h 2
For the sake of simplicity, let t be h, and assume that the speeds have the same direction.