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Determine the time after projection at which the speed of $B$ is $25\ \text{m s}^{-1}$ for the second time.
Mathematics 9709 · AS & A Level · Probability
Probability — practice question
A small ball $B$ is launched from a point on horizontal ground with speed $30\ \text{m s}^{-1}$ at an angle of $60^\circ$ above the horizontal.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply $v^2 = 25^2 - (30\cos 60)^2$ to determine the vertical velocity at the point needed” …
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