Choose the enternative Out of the following set of forces, the resultant of which can not be zero
O 10, 20, 40
O 10,10,10
10 10 20
O 10, 20, 20

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

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

c) both a and b.

0.11 m/s and 0.28 m/s should be correct