How would you calculate the resultant velocity of two velocities in the opposite direction?

below

Explanation:

For example, if the first object travels at 30 meters per second in the direction opposite to the first object's direction, multiply this velocity by -1, giving the second object a velocity of -30 meters per second. Multiply the second object's mass by its velocity.

a) cold, dry

explanation:

continental polar masses are cold and dry air masses because the cold air cannot hold much moisture. as they move into warmer air, they can trigger precipitation.