Potential Energy and Kinetic Energy Question

  • Thread starter gansta344u
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  • #1
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Homework Statement


A bird is flying with a speed of 17.4 m/s over
water when it accidentally drops a 2.20 kg
fish.
The acceleration of gravity is 9.81 m/s2 .
If the altitude of the bird is 7.70 m and air
resistance is disregarded, what is the speed of
the fish when it hits the water? Answer in
units of m/s.


Homework Equations


i tried to do potential energy equation PEg=mgh and then since it is converted to KE i re- arange the equation KE=1/2mv^2 and i tried it and it was wrong

3. The Attempt at a Solution [/b
 

Answers and Replies

  • #2
Doc Al
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Homework Equations


i tried to do potential energy equation PEg=mgh and then since it is converted to KE i re- arange the equation KE=1/2mv^2 and i tried it and it was wrong
The change in PE will tell you the change in KE. Don't forget that the fish already had KE when it was released.
 
  • #3
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so i have to add the KE of bird and PE of the fish
then use the KE=1/2MV^2
 
  • #4
Doc Al
Mentor
45,209
1,550
so i have to add the KE of bird and PE of the fish
then use the KE=1/2MV^2
Add the initial KE of the fish. (How fast is the fish moving when it's released?)
 
  • #5
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thanks a lot,i got it rite this time
 

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