Question

A ball is rolling down a hill. At one point near the top of the hill, its velocity is 2 m/s. Further down the hill, its velocity is 9 m/s. What is Δv?

Answer 1

7 m/s is your answer

Answer 2

+7 m/s

Step-by-step explanation:

`\Delta v` (change in velocity) is defined as the difference between the final velocity and the initial velocity:

`\Delta v = v_f -v_i`

where:

`v_f = 9 m/s` is the final velocity

`v_i = 2 m/s` is the initial velocity

Substituting the numbers into the equation, we find

`\Delta v = 9 m/s - 2 m/s = +7 m/s`

So, the ball has increased its velocity by 7 m/s.