Minimun Initial Kinetic Energy

  • Thread starter JoeDoe
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  • #1
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Homework Statement



A 7 kg shot put is thrown 18 meters. What was its minimun intial energy?

Homework Equations



When θ = 45°

Range = V0sin(2θ)/g

Velocity = √(R * g)
 

Answers and Replies

  • #2
Andrew Mason
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Homework Statement



A 7 kg shot put is thrown 18 meters. What was its minimun intial energy?

Homework Equations



When θ = 45°

Range = V0sin(2θ)/g

Velocity = √(R * g)
What is the energy of the shot when launched?
Express Energy as a function of θ. When is Energy minimum?

AM
 
  • #3
ehild
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Range = V0sin(2θ)/g

Check this equation.

ehild
 
  • #4
Chronos
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Is 45 degrees the optimal angle?
 
  • #5
ehild
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Yes it is, but your equation for the range is wrong. Check the dimension: it is time, not length.

ehild
 

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