[填空题]
A tennis ball of mass m=0.06kg and , ws+z-p dpm0ec5.7 q* kkossjspeez 4v8l9b*lad + fwdd5n-b2 vkzr0ow0,r7vtvyd v=25m/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
