Explain the differences between the two graphs.
(N/A) This graph represents the uniform acceleration of a body that starts from rest. At time $t = 0$,the velocity of the body is $0 \ m/s$.
$(b)$ This graph represents the uniform acceleration of a body that does not start from rest. At time $t = 0$,the body already possesses an initial velocity represented by the intercept on the velocity axis.
$(b)$ This graph represents the uniform acceleration of a body that does not start from rest. At time $t = 0$,the body already possesses an initial velocity represented by the intercept on the velocity axis.
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$(a)$ Calculate the magnitude of displacement of the truck in $15$ seconds.
$(b)$ During which part of the journey was the truck decelerating?
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