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Use the "cross product", the result is: 4 x (3b-6) = 9 x (2b+3) 12b - 24 = 18b + 27 -6b = 51 b = -51/6
a) Relevant equation: Emec = DU + DK If there are no nonconservative forces, this equation equals zero. Or in this case, some K is transformed into Eint (heat). So the equation becomes: Emec = Ff.d. (F in Newton, distance in meters and N.m = J). -> DU + DK
