A-LevelMathematicsMechanics9709/51 · Oct/Nov 2019 · Q26 Marks
A particle is projected from a point on horizontal ground with speed 15 m s¯¹ at an angle of θ° above the horizontal. The particle strikes the ground 2 s after projection.
- (i)Find θ.[2]
- (ii)Calculate the time after projection at which the direction of motion of the particle is 20° below the horizontal.[4]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [M1] Use v = u + at vertically
- [A1] (0=) 41.8
- [M1] v = vertical velocity
- [A1] v = (±)4.07
- [M1] Use v = u + at vertically
- [A1] (t =) 1.41 s
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