Question

when a material particle of mass m0 attain speed c it's mass becomes​

Answer 1

Answer:

Rest mass of an object is the inertial mass of that object when it is at rest. The relation between object's mass and rest mass is given by:  

where m  0  is rest mass, v is velocity of object and c is speed of light.  

Now, if some particle attains the velocity of light then according to the equation mentioned above it's mass becomes infinity.