Einstein's dream

From Special Theory of Relativity,

$\large{ m }_{ r }^{ }=\frac { { m }_{ 0 }^{ } }{ \sqrt { 1-{ \left( \frac { v }{ c } \right) }^{ 2 } } }$ , where ${ m }_{ r }$ is the relativistic mass, ${ m }_{ 0 }$ is the rest mass and $v$ is the speed of the system.

$\large{ m }_{ r }^{ }=\frac { { m }_{ 0 }^{ } }{ \sqrt { 1-{ \left( \frac { \frac { 3c }{ 5 } }{ c } \right) }^{ 2 } } }$ or $\large{ m }_{ r }^{ }=\frac { { 5m }_{ 0 }^{ } }{ 4 }$ .

This gives the relativistic mass of Einstein as $50\text{kg}$ .

This is actually a historical blunder because there is nothing known as relativistic mass and there is only rest mass. Einstein knew this fact