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  1. D

    How was your maths 42 M1

    yes you can try to solve it now
  2. D

    Mathematics: Post your doubts here!

    I think so but then again a value of 5.2 is way too large to be a coefficient of friction.. They also said P is applied to maintain equilibrium so i assumed they meant the box failed to stay at rest without P acting on it meaning it was falling.... so P had to act upwards? I dont know :/
  3. D

    How was your maths 42 M1

    Challenge accepted 1)A runner of mass 80kg increases his speed from 4ms^-1 to 5.5ms^1 against a restistive force P over a distance of 60m. Total work done is 1200J. Find the value of P 2)A train of mass 240000kg travels up a slope inclined at 4 degrees to the horizontal. The resistance to the...
  4. D

    Mathematics: Post your doubts here!

    no way you will lose alot of marks. I say youd gain marks for implying the rule for friction. One of the two equations you set is correct but the other is wrong so something like 4/7 (Btw you are one the few people who got 5.20 and think they are were wrong... Do you know what went wrong for...
  5. D

    How was your maths 42 M1

    Itll be accepted no worries
  6. D

    How was your maths 42 M1

    A runner of mass 80kg increases his speed from 4ms^-1 to 5.5ms^1 against a restistive force P over a distance of 60m. Total work done is 1200J. Find the value of P
  7. D

    Mathematics: Post your doubts here!

    i got 20
  8. D

    How was your maths 42 M1

    Exactly why i switched to the second method! μ being more than 5 is mad!!
  9. D

    How was your maths 42 M1

    They got 5.20 because they flipped the direction of P: For maximum value: P=20gsin(60)+20gcos(60)μ For minimum value: P+20gsin(60)=20gcos(60)μ(Now this is assuming P acts down the slope, alongside component of weight) Solving these equations gives μ=5.20 I honestly dont see whats wrong with...
  10. D

    How was your maths 42 M1

    did you confirm with your batch or teachers?
  11. D

    Mathematics: Post your doubts here!

    no mew can be more than 1 actually Edit: I got 2.06*10^6W
  12. D

    Mathematics: Post your doubts here!

    some people got the value 5.20 for mew instead of 0.577. What they did was reverse the direction of P such that now it acts down the plane. So the two simultaneous equataions become P(min)+20gsin(60)=20gcos(60)mew and P(max)=20gcos(60)mew+20gsin(60) and then P(max)=2P(min).. Did the question...
  13. D

    AS math 9709/May June/2018/ Paper 12 Hard Or Easy?

    Thank you very much :)
  14. D

    AS math 9709/May June/2018/ Paper 12 Hard Or Easy?

    the question where they asked us to find k such that 7-4cos(x)=k has no solutions... will i get the mark if, instead of drawing a graph, i rearrange it to cos(x)=(7-k)/4 and then solve the two inequalities (7-k)/4<-1 and (7-k)/4>1 to obtain the correct answers?
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