Question

What does kinetic energy at infinity mean in terms of supernovae?

Answer 1

That means that if the totalenergy, kinetic energy plus the negative potential energy, is negative, the object will eventually fall back to the earth and if it is positive, it can go "infinitely far" and still have positive kinetic energy. 

Answer 2

$hello \: frnd$
kinetic energy at infinity mean in terms of supernovae that


total energy+kinetic energy+potential energy=(-ve)


TE+KE+PE=(-ve)

in this case,the object will fall back eventually to the earth and if it is positive,it can go infinitely far and still have +ve KE .

hope it helps✌