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Problem:

1.a car accelerates from rest to a final speed of 21 m/s in 10 seconds .what acceleration did the car experience? how far does he travel during this period of acceleration ? Use equation C and E in solving the problem

d = 1/2 ( vf + vi ) t

  = 1/2 ( 21 m/s + 0 m/s ) 10 s

  = 1/2 × 210 m

 = 105 meters ( Answer )

2. A pickup truck moving at 28 m/S must come to a stop in a distance of 210 meters to avoid hitting a boulder has fallen into road .How much time does the driver have to avoid accident ? Use equation D in solving the problem.

t = d / 1/2 ( vf + vi )

 = 210 m / 1/2 ( 0 m/s + 28 m/s )

  = 210 m / 1/2 ( 28 m/s )

  = 210 m / 14 m/s

  = 15 seconds ( Answer )

3. What acceleration did the truck experience in question number 2? Use equation C in solving the problem.

a = ( Vf - vi ) / t

  = ( 0 m/s - 28 m/s ) / 15 s

 = - 1.87 m/s² ( Answer )

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