A-LevelMathematicsMechanics9709/42 · May/June 2019 · Q26 Marks
A car moves in a straight line with initial speed u m s⁻¹ and constant acceleration a m s⁻². The car takes 5 s to travel the first 80 m and it takes 8 s to travel the first 160 m. Find a and u.
- A car moves in a straight line with initial speed u m s⁻¹ and constant acceleration a m s⁻². The car takes 5 s to travel the first 80 m and it takes 8 s to travel the first 160 m. Find a and u.[6]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [M1] Use the equation s = ut + ½at² to set up one equation in u and a
- [A1] One correct equation in a and u
- [A1] Second correct equation in a and u
- [M1] Attempt to solve a pair of valid simultaneous equations for a or u
- [A1] Allow a = 2.67
- [A1] Allow u = 9.33
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