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1. Ian ice-skates 8 m in a straight line on an ice rink in 2 s. There's a collision with another skater and Ian is pushed 3 m straight backwards

for 1.5 s and falls down. It takes him 2 s to disentangle himself from the other skater and stand upright, then he skates straight forwards another 10 min 3 s. Calculate Ian's average velocity (a) for each of the intervals and (b) for the entire motion.

Fig: 1