1. The problem statement, all variables and given/known data The velocity of a body travelling in a circular orbit around another body situated at the centre of the circle, is given by v = √(GM/r) where G is the Universal Gravitational constant, M is the mass of the central body and r is the radius of the orbit. By taking natural logs (ln) of both sides rearrange the equation in the form of a straight line equation, with r as the independent variable and identify the meaning of the gradient and the meaning of the intercept 2. Relevant equations v = √(GM/r) 3. The attempt at a solution ln v = (1/2)ln(GM) - (1/2)lnr y = ln v x = lnr c = (1/2)ln(GM) m = -1/2 I solved the first part but was unsure as to how to answer this part of the question 'identify the meaning of the gradient and the meaning of the intercept'