Matter & Interactions 2nd ed. Practice Problems
Aaron Titus | High Point University
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(N)=# of solutions
1260002     Forces on a Moon lander as it is landing.     1260002
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Question

 

A 500-kg Moon lander has a velocity of 10 m/s downward when it is a certain height above the ground. 1 minute later, it is 1 m from the ground and its speed is 0.5 m/s downward. Assume that the thruster on the lander fires upward with a constant force. Moon's gravitational field strength near its surface is 1.6 N/kg.

  1. What is the force by the exhaust on the lander (i.e. thrust)?
  2. What was its initial height, when its speed was 5 m/s downward?