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2. A dog named Lassie goes this way, then that way: First she runs east at 4.50 m/s for 20 s. Then she runs west
at 8.00 m/s for 30 s, gets tired and pants for 5 s, then runs east at 3.0 m/s of 10 s. Take East to be the positive x
direction.
a) Find Lassie's average velocity.
b) Find Lassie's average speed.

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