When a body travel in speed of light does it mass will increase explain in brief

Dear student,
According to Einstein's special theory of relativity, as an object moves faster, its mass increases, while its length contracts.
​​​​​​At the speed of light, such an object has an infinite mass, while its length is 0 which is an impossibility in the real world.
Thus, no object can reach the speed of light.
Regards

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