Which of the given sets of vectors in r3, with the standard inner product, are orthogonal, orthonormal, or neither? (choose the option that best describes the set.) (a) 1 2 0 1 2 , − 1 2 0 1 2 , 0 1 0 orthogonal orthonormal neither?

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).