An aircraft on its take off has steady acceleration of 3m/s . What velocity does the aircraft gain in 4s? the answer was 12m/s .If that same aircraft pushes one post of the run away of velocity of 20m/s. What is its velocity 8s later?

Scissors and a seesaw both cut things that’s the only comparison

It has more electrons than an neutral object

Ican’t exactly answer this, but i can try to give a bit more info here.
astronomers are able to calculate a star’s life expectancy depending on its mass. (a larger star burns more gas, therefore having a shorter life span).
so astronomers can definitely predict the death of stars and the times they will die.
i hope this was in some way : )