The position of a particle moving along a coordinate line is s = :/73 + 4t, with s in meters and t in seconds. Find the particle's velocity and acceleration at t = 2 sec. The velocity at t = 2 sec is m/sec. (Simplify your answer. Type an integer or a fraction.) The acceleration at t = 2 sec is m/sec 2 (Simplify your answer. Type an integer or a fraction.)