77. Assuming the horizontal velocity of the ball is constant, the horizontal displacement isΔΔxv t=where Δxis the horizontal distance traveled, Δtis the time, and vis the (horizontal) velocity. Converting vto meters per second, we have 160 km/h = 44.4 m/s. Thus
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Speed of light, Orders of magnitude, Miles per hour, Kilometre, horizontal velocity, 1 kilometre