일반물리학 1 — Motion Along a Straight Line: Problem 66

66 In a forward punch in karate, the fist begins at rest at the waist and is brought rapidly forward until the arm is fully extended. The speed \(v(t)\) of the fist is given in Fig. 2-22 for someone skilled in karate. The vertical scaling is set by \(v_s = 8.0 \text{ m/s}\). How far has the fist moved at (a) time \(t = 50 \text{ ms}\) and (b) when the speed of the fist is maximum?