[填空题]
A horse canters away4zqal ;h1mw e -26gqx9 8qcehw63 adk*lc uet3 x41nfjfrom its trainer in a straight line, moving 116 m away in 14.0 s. It then turns abruptly and gallops halfway back in 4.8ntc1k46x aeuf3 d*lj3 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