Question

a baseball is traveling (+30 m/s) and is hit by a bat. it leaves the bat traveling (-40 m/s). what is the change in the velocity? remember that direction is what makes velocity different than speed. -10 m/s -30 m/s -40 m/s -70 m/s

Explanation:

Step1: Recall the formula for change in velocity

The formula for change in velocity $\Delta v$ is $\Delta v = v_f - v_i$, where $v_f$ is the final velocity and $v_i$ is the initial velocity.

Step2: Identify the initial and final velocities

Given $v_i=+ 30\ m/s$ and $v_f=-40\ m/s$.

Step3: Substitute values into the formula

$\Delta v=-40 - 30$.

Step4: Calculate the result

$\Delta v=-70\ m/s$.

Answer:

$-70\ m/s$