College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 88

A hockey puck slides along a horizontal ice surface at 20.0 m/s, hits a flat vertical wall, and bounces off. Its initial velocity vector makes an angle of 35° with the wall and it comes off at an angle of 25° moving at 10.0 m/s. Choose the + x -axis to be along the wall in the direction of motion and the y -axis to be perpendicular (into) to the wall. (a) Write each velocity in unit vector notation. (b) Determine the change in velocity in unit vector notation. (c) Determine the magnitude and direction, relative to the wall, of this velocity change.