Question

What is the kinetic energy of a 3 kg ball that is rolling at 3 m/s?

Answer 1

Kinetic energy =1/2mv^2.

1/2×3×3^2.

1/2×27=13.5 or 13 whole number 1/2.

Answer 2

`\Huge \boxed{\mathrm{13.5 \ Joules}}`

Step-by-step explanation:

`\sf Kinetic \ energy \ (J)=(1)/(2) \cdot mass \ (kg) \cdot (velocity \ (m/s)) ^2`

`\mathrm{KE=(1)/(2) mv^2}`

The mass of the ball is 3 kg.

The velocity of the ball rolling is 3 m/s.

`\mathrm{KE=(1)/(2) \cdot 3 \cdot 3^2}`

Evaluating and solving for kinetic energy.

`\mathrm{KE=(1)/(2) \cdot 3 \cdot 9}`

`\mathrm{KE=(1)/(2) \cdot 27}`

`\mathrm{KE} =13.5`

The kinetic energy of the ball is 13.5 Joules.