A car is being driven along a road at 25 m s-1 when the driver suddenly notices that there is a fallen tree blocking the road 65 m ahead. The driver immediately applies the brakes giving the car a constant acceleration of -5 m s-2. How far in front of the tree does the car come to rest? Ans: 2.5 m before.
Explanations & Calculations
"\\qquad\\qquad\n\\begin{aligned}\n\\small 0&=\\small (25\\,ms^{-1})^2+2(-5ms^{-2})(65-x)\\\\\n\\small x&=\\small 2.5\\,m \n\\end{aligned}"
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