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course Phy 121
20/Jul/2010 21:33
An automobile rolls 10 meters down a constant incline with slope .05 in 8 seconds, starting from rest. The same automobile requires 5 seconds to roll the same distance down an incline with slope .10, again starting from rest. *
At what average rate is the automobile's acceleration changing with respect to the slope of the incline?
answer/question/discussion:
Situation 1: (Incline .05)
Determine v_Ave:
10 m / 8 s = 1.25 m/s
Determine vf:
1.25 m/s * 2 = 2.5 m/s
Determine a:
2.5 m/s / 8 s = 0.31 m/s^2
Situation 2: (Incline .10)
Determine v_Ave:
10 m / 5 s = 2 m/s
Determine vf:
2 m/s * 2 = 4 m/s
Determine a:
4 m/s / 8 s = 0.5 m/s^2
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