An object is moving in a straight line. The object's displacement, in metres, from a fixed...

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An object is moving in a straight line. The object's displacement, in metres, from a fixed point is given by s(t)=-21³-4t² + 6t+4, where t≥0 and t is in seconds. Determine the acceleration of the object when the velocity is - 2 m/s. An object is moving in a straight line. The object's displacement, in metres, from a fixed point is given by s(t)=-21³-4t² + 6t+4, where t≥0 and t is in seconds. Determine the acceleration of the object when the velocity is - 2 m/s.