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Physics / University Physics 13 / Chapter 2 / Problem 40E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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Touchdown on the Moon. A lunar lander is making its

Chapter 2, Problem 40E

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QUESTION:

Touchdown on the Moon.? A lunar lander is making its descent to Moon Base I (?Fig. E2.40?). The lander descends slowly under the retro-thrust of its descent engine. The engine is cut off when the lander is 5.0 m above the surface and has a down-ward speed of 0.8 m/s. With the engine off, the lander is in free fall. What is the speed of the lander just before it touches the surface? The acceleration due to gravity on the moon is 1.6 m/s2.

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QUESTION:

Touchdown on the Moon.? A lunar lander is making its descent to Moon Base I (?Fig. E2.40?). The lander descends slowly under the retro-thrust of its descent engine. The engine is cut off when the lander is 5.0 m above the surface and has a down-ward speed of 0.8 m/s. With the engine off, the lander is in free fall. What is the speed of the lander just before it touches the surface? The acceleration due to gravity on the moon is 1.6 m/s2.

ANSWER:

Solution 40E The speed of the lander before free fall was, u = o.8 m/s. The height from where it released is, s = 5 m. The acceleration due to gra

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