Landing on the moon a spacecraft fires its retrorockets and, Ask an Expert

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Q. Landing on the Moon, a spacecraft fires its retrorockets and comes to a complete stop just 19m above the lunar surface. It then drops freely to the surface.How long does it take to fall in seconds? What is its impact speed in meter per seconds?

Q. A group of hikers hear an echo 1.00 s after they shout. If the temperature is 24.0°C, how far away is the mountain that reflected the sound wave?

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