Lunar lander velocity before hitting ground

  • Thread starter Lefty9602
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Homework Statement


A lunar lander is descending toward the moon's surface. Until the lander reaches the surface, its height above the surface of the moon is given by y(t)=b−ct+dt2, where b = 770m is the initial height of the lander above the surface, c = 62.0m/s , and d = 1.02m/s2 .
Part B: What is the velocity of the lunar lander before hitting the ground?

Homework Equations




The Attempt at a Solution


quadratic formula to find x intercepts. I don't know how I'm supposed to get the velocity before it hits the ground that could be at any point.
 

Answers and Replies

  • #2
BvU
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A matter of finding the pertaining relevant equation!
Do you recognize this y(t)=b − c t + d t2 ? Or do I nudge a bit harder by pointing at ##y(t) =y_0 + v_0t + {1\over 2} a t^2 ## ? What is the corresponding ##v(t) = ... ## equation ?

If all else fails, you can also apply ##v_y = {dy\over dt}## if that's familiar to you
 

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