Show that the density of a nucleus does not depend upon its mass number (density is independent of mass)

The escape velocity of a body depends upon its mass .m. as

Doppler shift in frequency does not depend upon

Consider the following statements. A, B and identify the correct choice in the given answers (A) Density of a nucleus is independent of its mass number (B) Beryllium is used as moderator in nuclear reactors

We know that the density of a cube can be measured by measuring its mass and length of its side. If the maximum errors in the measurement of mass and length are 3% and 2% respectively, what is the maximum error in the measurement of the density of the cube?