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

Question

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

anonymous · Answer

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:$$mgh=(1/2)mv^2=125\rightarrow v=5$$

anonymous · Answer

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

anonymous · Answer

Wow. Yes. You are correct. Brain fart.