. Momentum is proportional to an objects mass and its velocity, meaning that if either the mass or the velocity increases, the momentum will .

1) directly

2) increase or double

Explanation:

Momentum is directly proportional to an objects mass and its velocity, meaning that if either the mass or the velocity increases, the momentum will double/increase.

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

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

c) both a and b.

the answer is b, have negligible mass