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course phy201
Determine the acceleration of an object whose velocity is initially 24 cm/s and which accelerates uniformly through a distance of 66 cm in 3.8 seconds.
66cm/ 3.8 s = 17.36 vf
(17.36cm/s - 24 cm/s ) / 3.8 s = -1.74 cm/s/s
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You're on the right track, but 17.36 cm/s is the average velocity, so (17.36cm/s - 24 cm/s) is not the change in velocity.
The change in velocity is final velocity - initial velocity. Your calculation showed average velocity - final velocity.
You will need to use the initial velocity.
Knowing the average and final velocities, you can use the fact that the average velocity is halfway between the initial and final velocities.
In order to satisfy this condition, what must be the initial velocity?
What therefore is your result for the acceleration?
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