course Phy 121
A ball starts with velocity 0 and accelerates uniformly down a ramp of length 30 cm, covering the distance in 5 seconds. ?What is its average velocity?
answer/question/discussion: 6cm/sec
?If the acceleration of the ball is uniform then its average velocity is equal to the average of its initial and final velocities.
You know its average velocity, and you know the initial velocity is zero.
What therefore must be the final velocity?
answer/question/discussion: 30cm/sec
?By how much did its velocity therefore change?
answer/question/discussion: by 24cm/sec
?At what average rate did its velocity change with respect to clock time?
answer/question/discussion: 6cm/sec
you need to show the steps of your calculation, including units
In this case if the calculation is done correctly you get `dv / `dt = 30 cm/s / (5 s) = 6 cm/s^2, not 6 cm/s.
?What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: it would be a positive slope, slanting upward. As each increase, the line goes higher and higher.
&#Your work looks good. See my notes. Let me know if you have any questions. &#