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shelbybaby25

  • 4 years ago

If an 10 kg object has a potential energy of 125 J, what velocity would it be right before it hit the ground? Answer 250 m/s 50 m/s 25 m/s 5 m/s

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  1. hosein
    • 4 years ago
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    Hi when object hit to ground all of it's energy is KE & from conservation of energy we have PE(at first)=KE(in the end)so we have:\[mgh=(1/2)mv^2=125\rightarrow v=5\]

  2. hosein
    • 4 years ago
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    see this:\[0.5\times10 \times v^2=125\rightarrow 10\times v^2=250\rightarrow v^2=25\rightarrow v=\sqrt{25}\]so v=5

  3. eashmore
    • 4 years ago
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    Wow. Yes. You are correct. Brain fart.

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