Homework Answers
a) Partical is at rest at the two intervals.
i) 0-4.5 sec and ii) 10-11 sec
since position is not changing both the times
b) velocity is negative at 4.5 sec to 8 sec because slope is negative
c) particle is decelerating from 4.5 sec to 8 sec since velocity is decreasing continuously .
d) velocity at t= 12s
v= slope of line = 5-3/12-11=2/1
=2m/s
e) velocity at t=8 is zero as slope is zero
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