We read that mass is constant every where than why in speed of light maas increases . Mass can only increase if there is increase in number of atoms or molecule . Then we can say that increase in speed can increase atoms or molecules of an object

If a body will travel more the speed of light is mass will not remain constant
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No there is no increase in molecule its because of momentum which is combined effect of mass and velocity where velocity is too high results in change of mass
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