Achild rides her bike at a rate of 12.0 km/hr down the street. a squirrel suddenly runs in front of her so she applies the brakes and slows to 8.0 km/hr in 0.25 sec. what is the acceleration of the bike rider during this period?

Explanation:

First we have to change the velocity to km/s since the time is given in seconds.

12.0 km/hr = 3.33 × and

8.0 km/hr = 2.2 ×

The equation for acceleration is

and filling in:

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explanation: