[填空题]
A tennis ball of mass m=0.06kg andst e,y3fboug2b w x-rj)e +:t9 speed v=25m/. *zrxclfpc.l26d4f9f hz p8y s strikes a wall at a 45 $^{\circ} $ angle and rebounds with the same speed at 45 $^{\circ} $ (Fig. 7–32). What is the impulse (magnitude and direction) given to the ball? kg*m/s to the
