Kinetic Energy

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GED Science › Kinetic Energy

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A ball that has a mass of 2kg is launched upward at a velocity of $\small 4\frac{m}{s}$ . What is the initial kinetic energy of the ball?

Assume the ball is traveling in a vacuum.

$\small 16J$

CORRECT

$\small 8\frac{kg\cdot m}{s}$

$\small 32J$

$\small 16\frac{kg \cdot m}{s}$

Explanation

Kinetic energy (measured in Joules) can be solved using the equation:

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

We are given both the mass of the projectile (2kg) and its velocity ( $\small 4\frac{m}{s}$ ). Using these values, we can solve the equation.
$KE=\frac{1}{2}(2kg)(4\frac{m}{s})^2$

$KE=\frac{1}{2}(2kg)(16\frac{m^2}{s^2})$

$KE=16\frac{kg\cdot m^2}{s^2}=16J$

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