Question

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

Answer 1

Answer:

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

Explanation:

$\sf Kinetic \ energy \ (J)=\frac{1}{2} \cdot mass \ (kg) \cdot (velocity \ (m/s)) ^2$

$\mathrm{KE=\frac{1}{2} mv^2}$

The mass of the ball is 3 kg.

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

$\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 3^2}$

Evaluating and solving for kinetic energy.

$\mathrm{KE=\frac{1}{2} \cdot 3 \cdot 9}$

$\mathrm{KE=\frac{1}{2} \cdot 27}$

$\mathrm{KE} =13.5$

The kinetic energy of the ball is 13.5 Joules.

Answer 2

Answer:

Kinetic energy =1/2mv^2.

1/2×3×3^2.

1/2×27=13.5 or 13 whole number 1/2.