What is the change in velocity if a car traveling 30{m}/{s} north slows to 20{m}/{s} north?
A. 20{m}/{s} north
B. 10{m}/{s} north
C. 30{m}/{s} south
D. 10 {m}/{s} south
B. 10 m/s, North.
To find the change in velocity, we need to subtract the final velocity from the initial velocity. The initial velocity is given as 30 m/s north, and the final velocity is given as 20 m/s north.
To find the change in velocity, we subtract 20 m/s north from 30 m/s north:
30 m/s north - 20 m/s north = 10 m/s north.
So, the change in velocity is 10 m/s north.
Therefore, the correct answer is:
B. 10 m/s north.