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course Phys201
6/11@5:30pm
An object travels a distance of 32 cm in 17.6 seconds from start to finish. If its acceleration is uniform and its initial velocity zero, then what are its average velocity, acceleration and final velocity?
vAve-`ds/`dt
vAve=32cm/17.6 sec
vAve=1.8 cm/sec
vf=1.8 cm/sec*17.6 sec
vf=32 cm/sec
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vf is not equal to vAve * `dt.
And 1.8 cm/s * 17.6 s is not equal to 32 cm/s. cm/s * s = cm, so the result is 32 cm.
What is the meaning of this result?
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acceleration= (final velocity - initial velocity) ÷ time elapsed.
a=(32-0)/17.6
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There are no units in this calculation.
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a=1.8 cm/sec
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cm/sec is not a unit of acceleration.
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