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Question

When we move we have a certain velocity. Newton had said that mass remains constant but if one derivates the equation dp/dt u get mdvdt+vdmdt people say mass is constant but by Special relativity M=m/sq.rt (1v2c2) could you please explain this and also please explain if our mass changes and when we come back to rest what is that extra mass converted into?

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Solution

# Classical physics (physics of cycle objects)
When the object is moving at a speed much much lesser than the speed of light, then the mass of the body remains constant and all of Newton's law will be followed by that object.

# Quantum physics (physics of small particles photons, electrons)
When the particles are moving at the speed of light, laws of classical physics fails. We cannot use simple equations of motion to define the motion of the small particles.
Theory of relativity states that mass is also a form of energy. We can transform mass into every, E=mc2 speed of light change in mass of the object
When particles are moving close to speed of light, their mass is given by :
M=M1v2C2 Speed which is close to speed of light
You can see mass of the particle becomes infinite if they move with speed of light
M=M1/c2/c2=M11=
Change is the mass of the object can be found by conservation of energy.
The difference is mass gives the amount of energy produced when mass is converted into energy.
E=Δmc2
change is mass

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