A hockey puck has an initial velocity of 53 m/s and a final velocity of 39 m/s. (a) If it travels 50 m during this time, what is the acceleration? (Recall that a deceleration implies that the acceleration has a negative sign. -2 m/s^2 Submit Answer Incorrect. Tries 2/5 Previous Tries (b) If the mass of the puck is 0.6 kg, what is the horizontal force on the puck? (Be careful about the sign of the force.) -7.728 N Submit Answer Incorrect. Tries 2/5 Previous Tries