일반물리학 1 — Center of Mass and Linear Momentum: Problem 28

28 In tae-kwon-do, a hand is slammed down onto a target at a speed of 13 m/s and comes to a stop during the 5.5 ms collision. Assume that during the impact the hand is independent of the arm and has a mass of 0.70 kg. What are the magnitudes of (a) impulse and (b) average force on the hand from the target?