Unit of mass velocity is A) kg/m.hr B) kg/m2.hr C) kg/hr D) kg/m2 Related MCQs: How many times Mass of earth is greater than the mass of Mars? Let us suppose a mass on Earth is 100 kg. What will be the mass of the moon? Hess’s law of constant heat summation is based on conservation of mass. It deals with Current velocity through a copper conductor is