7. A 2.0-kg block starts from rest on the positive x axis 3.0 m from the origin and thereafter has an acceleration given by . The torque, relative to the origin, acting on it at the end of 2.0 s is: (A) (0 N●m) (B)(-18N●m) (C) (+24 N●m) (D)(-I44N●m) (E) (+144 N● m) .
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. The torque, relative to the origin, acting on it at the end of 2.0 s is: 
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