If the Displacement of an Object Is Given in SI

Multiple Choice

If the displacement of an object is given in SI units by Δx = −5t + t ²,at t = 2 s its velocity and acceleration are,respectively: (Hint: Use dimensional analysis along with the equations for motion with constant acceleration. )

A) positive,positive.
B) positive,negative.
C) negative,negative.
D) negative,positive.