[填空题]
A horse canters away ess7 4(0iylvo/gucsia297.)fe ws ac from its t .m2lzbkd(f;aifg(ut6;i - zvrainer in a straight line, moving 116 m away in 14.0 s. It then turns abruptly and gallops halzud(6t-z .;f 2vi kim;ga(bf lfway back in 4.8 s. Calculate
(a) its average speed m/s
(b) its average velocity for the entire trip, using “away from the trainer” as the positive direction. m/s