I have tried the answer 3.9149 and 3.914, it is incorrect

In a closed or isolated system , matter can not be created or destroyed. it can change forms but is conserved true or false

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction