A gravity force of 390N acts on the moped. Determine the mass of the moped.

Since the gravity force F = 390 N acts on the moped, arising from gravity and determined by the formula: F = m · g, where the constant coefficient of proportionality between the mass of the body and the force of gravity to the earth is g = 9.8 N / kg, then determine the mass of the moped m, you need to find the quotient F: g, that is, m = F: g. We substitute the values of physical quantities into the resulting formula and perform calculations, we obtain m = 390 N: 9.8 N / kg; m = 39.79 kg. Answer: the mass of the moped is approximately 39.79 kilograms.