Ask Uncle Colin: A load of parabolics | Colin

Ask Uncle Colin is a chance to ask your burning, possibly embarrassing, maths questions — and to show off your skills at coming up with clever acronyms. Send your questions to and Uncle Colin will do what he can.

Dear Uncle Colin,

One of my students recently attempted the following question: “At time $t=0$ particle is projected upwards with a speed of 10.5m/s from a point 10m above the ground. It hits the ground with a speed of 17.5m/s at time $T$. Find $T$.” They used the equation $s = vt – \frac 12 at^2$ and found $T = \frac{5}{7}$ and $T=\frac{20}{7}$…

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