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polet [3.4K]
3 years ago
11

A toy plane with a mass of 20 kg is flying at 10 m/s. What is its kinetic energy?

Physics
2 answers:
egoroff_w [7]3 years ago
6 0
A

On edg. ‘1,000 j’ hope it helps !:)
gladu [14]3 years ago
4 0

Answer:

\boxed {\boxed {\sf A. \ 1000 \ Joules}}

Explanation:

Kinetic energy can be found using the following formula.

E_k=\frac{1}{2}mv^2

where <em>m</em> is the mass and <em>v</em> is the velocity.

The mass of the toy plane is 20 kilograms and the velocity is 10 meters per second.

m= 20 \ kg \\v= 10 \ m/s  \\

Substitute the values into the formula.

E_k=\frac{1}{2}(20 \ kg) (10 \ m/s)^2

Solve the exponent first.

  • (10 m/s)²= 10 m/s *10 m/s= 100 m²/s²

E_k=\frac{1}{2} (20 \ kg) (100 \ m^2/s^2)

Multiply the last two numbers together.

E_k= \frac{1}{2}(2000 \ kg*m^2/s^2)

Multiply by 1/2 or divide by 2.

E_k= 1000 \ kg*m^2/s^2

  • 1 kilogram square meter per square second is equal to 1 Joule.
  • Our answer of 1000 kg*m²/s² is equal to 1000 Joules

E_k= 1000 \ J

The kinetic energy of the toy plane is <u>1000 Joules</u>

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