Calculate the momentum of a 20kg cart traveling to the right with a
velocity of 20m/s. *

momentum= mass x velocity

= 20 x 20 =400kgm/s

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

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

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

c) both a and b.