Question

After completing your motion diagram, it's time to choose an appropriate coordinate system for this problem. Note that there is no single correct way to visualize this problem, but for the questions that follow, assume that the pucks are moving along the x axis with directed to the right. Take the initial position of puck A, when it is at rest, to be at the origin, and take the initial position of puck B to be to the right of puck A. Start your clock at the instant when the pucks begin to move Review Learning Goal: To practice Problem-Solving Strategy for general problems Based on the assumptions listed above, sort the following quantities as known or unknown. Drag the appropriate items to their respective bins. Two hockey pucks, labeled A and B, are initially at rest on a smooth ice surface and are separated by a distance of 18.0 Im. Simultaneously, each puck is given a quick push, and they begin to slide directly toward each other. Puck A moves with a speed of 1.50 m/s, and puck B moves with a speed of 2.50 m/s Reset Heilp the initial position the initial position(when the pucks f collision the inital time the moment of puck A of puck B begin to move) What is the distance covered by puck A by the time the two pucks collide? the position of the position of the initial velocity of puck A puck A at the moment puck B at the moment of collision of collision the initial velocity of puck B Known Unknown

Answer 1

Given that distance between PUCKS d = 18 m speed of PUCK A = v_a = 1.50 m/s velocity of PUCK = v_b = -2.50 m/s relative speed of A w middot r middot t B is given as V_ab = v_a - v_b = 1.50 - (-2.50) V_ab = 1.50 + 2.50 therefore V_ab = 4 m/s t = time for collision \r\n t = d/V_ab t = 18/4 t = 4.5 sec distance covered by PUCK A X_a = v_a t X_a = 1.50 times 4.5 X_a = 6.75 m