Oh, you can't hear me cry See my dreams all die
From where you're standing
On your own
It's so quiet here
And I feel so cold
This house no longer
Feels like home

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

im guessing the west of station b

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.