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Influenced by the gravitational pull of a distant star, the velocity of an asteroid changes from from +19.7 km/s to -17.9 km/s over a period of 1.96 years. (a) What is the total change in the asteroid's velocity? (Indicate the direction with the sign of your answer.) m/s (b) What is the asteroid's average acceleration during this interval? (Indicate the direction with the sign of your answer.) m/s2