Brief answers to Exam #1 from 2007.

(BTW: There used to be a typo in #5 - it said the graph was position, although the axis was labeled as velocity)

1d 2a 3d 4d 5b 6d 7d 8b 9d 10b

11a) x-component of first displacement = -10 m, y-component of first displacement = 0, x-component of second displacement = 4.53 m, y-component of second displacement = 2.11m

b) x-component of total displacement = -5.47 m, y-component of total displacement = 2.11 m

c) magnitude = 5.86 m, angle = 158 degrees (CCW from east)

12a) 68.6 mi/hr² b) part one: 0.35 hr, part two: 0.29 hr, total: 0.64 hr c) 54.4 mph

13a)9.4 m/s b) -0.4 m/s (you see it on its way down) c) 4.51 m

14a) 1.75 s b) 0.764 s c) 6m/s²

15a) beginning of plot to 0.7 s and 2.2s to end of plot

b) At 0.7 s and at 2.2s

c) from beginning of graph to 1.6 s

d) from 0.7 s to 1.6 s and from 2.2 s to end of plot