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halosh92:
june 2005 paper 1:
 Q3
Q4
Q13

astarmathsandphysics:
3. v=d/t=100/10=10
KE=1/2mv^2=1/2*80*10^2=4000 B
4)speed=40/2.5=16
I made this anser 16+-0.322
13)-2*5-2*10+3*20=30 A

halosh92:

--- Quote from: astarmathsandphysics on March 09, 2010, 10:06:53 am ---3. v=d/t=100/10=10
KE=1/2mv^2=1/2*80*10^2=4000 B
4)speed=40/2.5=16
I made this anser 16+-0.322
13)-2*5-2*10+3*20=30 A

--- End quote ---

thx! but am still unclear like for the 3rd one , how did u know that the time is 10 seconds?
and the second one i know how to get 16, but i couldnt reach for the uncertainty
and the 3rd one could u elaborate..like why did u choose these measurements to multiply with the forces?

astarmathsandphysics:
I0 seconds cos this is what olympic athletes take to run 100m. For the last one it force x distance from P to the force

halosh92:
Q16
Q22
Q25
Q32
Q33

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