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Just_One

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Ok I see it has not to be 45. If the slope is let say 55 that your angle will need to be larger than 45 and minor than 90. I would go (90+55)/2.
Why 90? assuming alpha=30 (let's just say) then the resulting angle will be 60 which does not make sense since the plane is already inclined at 30 degrees.
Power should be the difference in KE when start moving and t final divided by time. Since KE and Power have the same unit and watts is a unit in function of time that is why you need to take the time interval of motion.
I got 6.99 for part B. F=.8 and m=3. Would you please verify. Part A for me is 33.33 Thanks.
Look at this however I am confused about the t^3. I know that is comes from integration but not sure of why the integration if the F(t)Bt^2 is supposed to describe you non linear force in function of a. answers yah_o_o c_om/ question/
For part A this is what I did and I got 20 for me and validated 25 for some of you. F=ma a=F/m Because this is not constant acceleration V=at^2. Do not divide by 2! Then P=mv which result in 25 for some of you and 20 for me.

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