A car moves at 25 m/s. The driver brakes hard and it slows at a steady 5 m/s²…

Contributed by StemPy Lab

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

A car moves at $25\ \text{m/s}$ . The driver brakes hard and it slows at a steady $5\ \text{m/s}^2$ . How far does it go before it stops?

Need a reminder? The key ideaShow

For steady acceleration: $v = u + at$ , $s = ut + \tfrac12 at^2$ , $v^2 = u^2 + 2as$ , and $s = \tfrac12(u + v)t$ .

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.

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