A-LevelMathematicsMechanics9709/52 · Feb/Mar 2017 · Q15 Marks
A small ball is projected with speed 15 m s¯¹ at an angle of 60° above the horizontal. Find the distance from the point of projection of the ball at the instant when it is travelling horizontally.
- Full QuestionA small ball is projected with speed 15 m s¯¹ at an angle of 60° above the horizontal. Find the distance from the point of projection of the ball at the instant when it is travelling horizontally.[5]
Mark scheme
Marking points from the official mark scheme (Feb/Mar 2017). The mark or mark type is shown in brackets.
- [M1] Uses v = u + at vertically
- [A1] (t = 3√3/4 = 1.30)
- [B1] Uses v² = u² + 2as vertically
- [M1] Applies Pythagoras's theorem
- [A1] D = 12.9 m
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