If an Object Moves in Such a Way That After $D ( t ) = t ^ { 3 } - 15 t ^ { 2 } + 80 t$

Short Answer

If an object moves in such a way that after t seconds, the distance from its starting point is $D ( t ) = t ^ { 3 } - 15 t ^ { 2 } + 80 t$ meters, find the acceleration after 2 seconds in meters/s².