A-LevelMathematicsMechanics9709/43 · May/June 2017 · Q15 Marks
A man pushes a wheelbarrow of mass 25 kg along a horizontal road with a constant force of magnitude 35 N at an angle of 20° below the horizontal. There is a constant resistance to motion of 15 N. The wheelbarrow moves a distance of 12 m from rest.
- (i)Find the work done by the man.[2]
- (ii)Find the speed attained by the wheelbarrow after 12 m.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- M1 Uses WD = Fd cos 0
- A1 395 J
- (B1 WD against resistance = 15 × 12
- M1 Uses WDman = WDresistance + KE gain
- A1) v = 4.14 ms⁻¹
- (B1 Applies Newton's Second Law
- M1 Uses v² = u² + 2as
- A1) v = 4.14 ms⁻¹
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →