Where, **$\rho$** is density,

The weight mass formula is given by

Where, **w **is the weight,

**m **is the mass,

**g **is the gravity

The mass formula is also given byIf acceleration **a **is itself the gravity then

Where,**F **is the force,

Where,

There is well known Einstein's mass energy relation that gives mass energy formula as

Where, **E **is energy,

**m **is mass,

**c **is speed of light

The kinetic energy mass formula is given by

The kinetic energy mass formula is given by

Where **K.E** is kinetic energy,

**m **is the mass,

**v **is the velocity.

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weight of the body = 70 N, Mass of the body m=?

The mass of the body is given by

m = $\frac{w}{g}$

= $\frac{70\ N}{9.8\ m/s^2}$

= 7.15 kg

Given: Mass of the body m = ?, kinetic energy k.E = 50 J, velocity v = 5m/s

The mass is given by

m = $\frac{2\ k.E}{v^2}$

= $\frac{2\ \times 50\ J}{5^2}$

= 4 kg.