A body moving according to the relation x = 20 +4t^2 a- Determine the displacement of the body during the interval

A body moving according to the relation x = 20 +4t^2
a- Determine the displacement of the body during the interval t1 = 2 sec ,t2= 5 sec
b- Find average velocity during this interval
c- Find the velocity at t= 2 sec

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