A ball was rolling downhill at 2 m/s. After 5s, it was rolling at 90 m/s. What is its acceleration?

17.6 m/s²

Explanation:

Given:

= 90 m/s (final velocity)

= 2 m/s (initial velocity)

Δt = 5s (change in time)

The formula for acceleration is:

= Δv / Δt

We can find Δv by doing

Δv = -

Replace the values

Δv = 90m/s - 2m/s

Δv= 88m/s

Using the equation from earlier, we can find the acceleration by dividing the average velocity by time.

= Δv / Δt

=

acceleration = 17.6

0.863333

86%

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