A planet of radius R has nonuniform density given by the equation: ρ(r)=ρ0r , where r is the distance from the center of the planet. Which of the following is a correct expression for the acceleration due to gravity g at the surface of the planet?

i. like it i'm gonna edit it tomorrow

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

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i just did this and got a 100.

less than one you can't create energy