If an arrow is shot upward on the moon with a velocity of 54 m/s, its height (in meters) after t seconds is given by H = 54t - 0.83t². (a) Find the velocity of the arrow after one second. m/s (b) Find the velocity of the arrow when t = a. m/s (c) When will the arrow hit the surface? (Round your answer to one decimal place.) t = S (d) with what velocity will the arrow hit the surface? m/s

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