Was the "Big Bang" really loud? a) No, because there was no air yet and sound must travel through air.
b) Yes, because there was heat involved
c)Yes, because it was an explosion
d) No, because we were too far away to hear it.​

a displacement distance is size of displ

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.