Amna Saeed · 2026-08-08T17:51:56.026Z

proton always has mass when it is in motion that is also known as effective or kinetic mass but when a proton stops its mass become zero it is its rest mass

Amna Saeed · 2026-08-08T17:53:48.596Z

and rest mass that is zero can never be equal to effective mass

Umm e mavia · 2026-08-08T17:56:36.323Z

Effective kinetic mass ka matlab ye hai ke particle ki energy ko mass ke form mein express karna. Ye actual rest mass nahi hota. For example, photon ka rest mass zero hota hai, lekin uski energy hoti hai, isliye uska effective mass E/c^2 likh sakte hain