Over a time interval of 1.92 years the velocity of a planet, Ask an Expert

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Over a time interval of 1.92 years, the velocity of a planet orbiting a distant star reverses direction, changing from +19.7 km/s to -19.1 km/s. Find the following values, include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. (a) the total change in the planet's velocity (m/s) (b) its average acceleration during this interval (m/s^2)

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