Atoy plane has a mass of 2.5 kg and is 18 m above the ground. it is moving at 4.5 m/s. how much mechanical energy does the

4 answers
Question:

Atoy plane has a mass of 2.5 kg and is 18 m above the ground. it is moving at 4.5 m/s. how much mechanical energy does the toy plane have? 416 j 441 j 466 j 491 j

Answers

Mechanical energy is the sum of kinetic energy and potential energy, or E=Ek+Ep. So Ek=(1/2)*m*v² where m is the mass of the object and v is it's velocity. Mp=m*g*h where m is the mass, g=9.81 m/s² and h is the height of the object. So after we input the numbers the total mechanical energy is
E=(1/2)*2.5*(4.5²) + 2.5*9.81*18 = 25.3125 J + 441.45 J = 466.7625 J. The correct answer is E= 466 J. 

466 J

Explanation:

I just took the quiz

So i took the quiz and i got it right but i didn't any work but i got 466 so yeah sorry for not being able to explain it any better.

So we want to know the total mechanical energy that a toy plane has. It's mass m= 2.5 kg, it's height is h=18 m above the ground and it's speed is v=4.5 m/s. Mechanical energy is E= Ek + Ep where E is total mechanical energy, Ek is the kinetic energy and Ep is the potential energy. Its Ek=(1/2)*m*v^2 where m is mass and v is the speed of the toy plane. Potential energy Ep=m*g*h where m is mass, g=9.81 m/s^2 and h is height of the toy plane. So lets input the numbers: Ek=(1/2)*2.5*(4.5)^2=25.3125 J, Ep=2.5*9.81*18= 441.45 J. Now lets add the two energies to get the total energy: E= 25.3125 J + 441.45 J = 466.7625 J. So the total mechanical energy of a toy plane is E= 466 J.

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