Question

A baseball is traveling (+20 m/s) and is hit by a bat. It leaves the bat traveling (-30 m/s). What is the change in the velocity?
A) 10 m/s

B) 20 m/s

C) 30 m/s

D) 50 m/s

Answer 1

Answer: Option (D) is the correct answer.

Explanation:

Change in velocity is calculated when initial velocity is subtracted from final velocity.

Formula to calculate change in velocity is as follows.

            $\Delta V = final velocity (V_{f}) - initial velocity (V_{i})$

                                  = (-30 m/s) - (+20 m/s)

                                  = (-30 - 20) m/s

                                  = - 50 m/s

Therefore, change in velocity is 50 m/s.

Answer 2

D.

A more accurate answer would be -50 m/s. 50 m/s is the change in speed.