A car's speed goes up from 18 km/h to 54 km/h in 4 s. Find its acceleration in m/s².
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A car's speed goes up from to in . Find its acceleration in .
Need a reminder? The key ideaShow
Acceleration , in . It is positive when the velocity grows and negative when it falls in the positive direction.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Units. and .
Step 2. Acceleration. .
Answer: .
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