"A racquetball of mass m = 43.3 g, initially moving at 40.0 m/s horizontally in the positive x direction, is struck by a racket. After being struck, the ball moves back in the opposite direction at an angle of 20.0° above the horizontal with a speed of 57.0 m/s. What is the average vector force exerted on the racket by the ball if they are in contact for 2.40 ms? (Assume the positive y direction is vertically upward. Express your answer in vector form.)"

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.