Posted by John on Friday, January 21, 2011 at 3:40pm.
A point moving on a straight horizontal
line with an initial velocity of 60 fps to the right
is given an acceleration of 12 fps2 to the left for
8 sec.
Determine (a) the total distance traveled during
the 8sec interval; (b) the displacement during
the 8sec interval.

physics  drwls, Friday, January 21, 2011 at 4:47pm
At the beginning of the 8 s interval, the velocity is 60 ft/s.
At the end of the 8s interval, the velocity is 60  12*8 = 36 ft/s
The average velocity during the interval is (6036)/2 = 12 ft/s
You can multiply that by 8 s for the total displacement.
(a) X = 60 t  6 t^2
Maximum X value occurs @ dX/dt = 0, where t = 5 s. The value of X at that time is 300  150 = 150 ft. Then it goes backwards until t = 8, when
X(final) = 480  384 = 96 ft.
Total distance traveled, regardless of direction, is 150 + 96 = 246 ft
(b) Displacement from starting position = 96 feet. We already found that out part (a)
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