Finding the speed before impact using the work-energy theorem

  • #1

Homework Statement


A blue whale materializes 11.5 km above an airless planet with an acceleration of gravity of 6.85 m/s2. What is the speed of the whale right before impact? Use the work energy theorem.

Homework Equations



Work energy theorem : W = the change in k
W=kf - ko
w=1/2(mvf2) - 1/2(mvo2)
 

Answers and Replies

  • #2
Doc Al
Mentor
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So what force acts on the whale? How much work is done by that force as the whale falls to the surface?
 

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