Q19. the relativistic form of newton's second law of motion is (a) f=- b) f=vc*-y? dv vc-v dt dt mc (c) f2 (d) f=m -ydv c dt c-v dt

option c is correct... remember there is difference between rest Mass and relativistic mass.. in relativity, f=ma violates...

you may further simply the expression.

none of the above matching dear.

see attached file

I have derived the formula for you. I used formula of relativistic momentum and derived it with respect to time. Best regards.

this will also help you. because newtons second law is rate of change of momentum. and in momentum due to relativity we multiply by gamma factor. so the output that comes i attache...