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Determine the ball’s angle of projection.
Mathematics 9709 · AS & A Level · Probability
Probability — practice question
A small ball is launched from a point $1.5\,\text{m}$ above level ground. When it reaches a height of $9\,\text{m}$ above the ground, it is moving at $45^\circ$ above the horizontal with speed $4\,\text{m s}^{-1}$.