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simba:
Q: A of mass 4 kg is pulled from rest to a speed of 4.5m/s in time of 3 seconds on a rough horizontal surface by a force of 20N which makes an angle of 10 degrees with the horizontal.Find the coefficient of friction....



will sm1 help !!!

astarmathsandphysics:
Res vertically
R+20sin10-4g=0 so R=4g-20sin10
res horizontally 20cos10-uR=ma=4*(4.5/3)=6 so uR=20cos10-6
u=(20cos10-6)/(4g-20sin10)

Phosu:
doubt

edexcel m1 jan 03 ques 7b

marking scheme says
-1.5=22.4t-4.9t^2

what i dont understand is why is -1.5 being used as the distance...?

nid404:
Could you post the paper cuz i don't have it...

my guess is the distance travelled may be in the opp dir....

astarmathsandphysics:
Without having read the question I agree. Did it land below the Start point?

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