39. A dog runs on a waxed floor at an initial speed of 2 m/s. It slides to a stop with an acceleration of -0.43 m/s2. How long does it take for the dog to stop?

Explanation:

Use the one-dimensional equation

where vf is the final velocity of the dog, v0 is the initial velocity of the dog, a is the acceleration of the dog, and t is the time it takesto reach that final velocity. For us:

0 = 2 + -.43t and

-2 = -.43t so

t = 4.7 seconds

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explanation: