Correct Answer to Question 4 Correct Answer to Question 4
During the time interval t = 1 sec to
t = 2 sec, the speed increases uniformly
from 20 m/sec to 40 m/sec.
Hence the average speed <V>
during this interval is:
<V> = (20 + 40) / 2 = 30 m/sec.
The displacement change
X
during this time interval is
X =
<V>t.
The time interval
t
is 2 - 1 = 1 sec, so the displacement change is
X = 30 * 1 = 30 m.
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