# Mass Energy Formula

## Learn The Mass Energy Formula As Per Einstein’s Theory

According to Einstein’s Theory, equivalent energy can be calculated using the mass(m) and the speed of light.

$E=mc^{2}$

E = equivalent energy

m = mass in kg

$c\cong 3\times 10^{8}m/s$

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#### Practise This Question

A bowling ball is thrown down the alley in such a way that it slides with a speed v0 initially without rolling. What will it it's speed be when (and if) it starts pure rolling? The transition from pure sliding to pure rolling is gradual, so that both sliding and rolling takes place during this interval.