Question

In a rocket m changes with time. write down the mathematical form of Newton's Law in this case and interpret it physically.

Answer 1

Great question
okay remember Newton second law of motion i.e.
force is rate of change of momentum right
now
force d(mv)/dt
now as mass in not constant we will do partial differentiation
and get
f=v*dm/dt+m*dv/dt
hope it helps
we know just
f= mdv/dt because mass is constant in most of the cases

Answer 2

Answer:

Newton's 3rd law of conservation of momentum is the law used in this case