Kinetic Energy

A 10 kN motorcycle is traveling at 100 kilometers per hour. What is its kinetic energy?

Hint
$$$Force=mass\times acceleration$$$
Hint 2
Kinetic Energy:
$$$KE=\frac{1}{2}mv^2$$$
where $$m$$ is the mass and $$v$$ is the velocity.
In the problem statement, the weight of the car is given as a force. To find the mass:
$$$F=m\times a$$$
where $$F$$ is the force, $$m$$ is the mass, and $$a$$ is the acceleration due to gravity. Thus,
$$$10kN=m\times 9.81\frac{m}{s^2}$$$
$$$m=\frac{10,000kg\cdot (m/s^2)}{9.81m/s^2}=1,019.37\:kg$$$
Next, convert the velocity into meters per second:
$$$100 \frac{km}{hr}\cdot \frac{1,000m}{km}\cdot \frac{hr}{60min}\cdot \frac{min}{60s}=27.78\:m/s$$$
Finally, to solve for Kinetic Energy:
$$$KE=\frac{1}{2}mv^2$$$
where $$m$$ is the mass and $$v$$ is the velocity.
$$$KE=\frac{1}{2}(1,019.37kg)(27.78m/s)^2=393,338kg\cdot \frac{m^2}{s^2}$$$
$$$=393,338N\cdot m=393\:kJ$$$
393 kJ