3.2. Impulse obtained from images
The ball launched from the launcher hits the racket and reflect as shown in the photo (Fig. 4). We analyzed
images to obtain the vertical velocities vv0 and vv1 and horizontal velocities vh0, vh1 before and after collision, and the
angular velocity of the ball after collision . These values were inserted into equations 1), 2) and 3) to calculate the
vertical and horizontal components of impulse.
We were able to observe the ball rolling and slipping on the string-bed surface for angles of incidence 30° and
15°.