Question

A driver at Dewan Motors is testing a new model car with a speedometer calibrated to read m/s
rather than km/h. The following series of speedometer readings was obtained during a test run
along a long, straight road:
Time (s)
(m/s)
0 1 3
3 5 7 9 11 13
4.
19 Speed
0 0
7
(a)
Compute the average acceleration during each 2-s interval. Is the acceleration constant? Is it
constant during any part of the test run?
(b) Make a (v-t) graph of the data, using scales of 1cm = 1s horizontally and 1cm = 2m/s
vertically. Draw a smooth curve through the plotted points. By measuring the slope of your
curve, find the instantaneous acceleration at t = 6 s, 18 s, and 25 s.​

Answer 1

Answer:

(a) ac = V/S = (4+0)/(3-1) = 2 m/s

ac = V/S = (7+4)/(5-3) = 5.5 m/s

ac = V/S = (13+10)/(7-5) = 8.5 m/s

ac = V/S = (13+10)/(9-7) = 11.5 m/s

ac = V/S = (17+13)/(11-9) = 15 m/s

ac = V/S = (22+17)/(13-11) = 19.5 m/s

ac = V/S = (23+22)/(15-13) = 22.5 m/s

ac = V/S = (26+23)/(17-15) = 24.5 m/s

ac = V/S = (29+26)/(19-17) = 27.5m/s

Explanation:

(b)