[填空题]
A golf ball of mass 0.045 kg is hit off the tee + 8 mwaj34hn(bi.qzx1/jaq;ffi,wd xat a speed of 45m/s The golf cpmmg,)4 bd qf+kx5b .blub was in contact with th45,dqb gpbf .)b x+mmke ball for $3.5\times10^{-3}$s Find (a) the impulse imparted to the golf ball, kg*m/s
(b) the average force exerted on the ball by the golf club. N
