Shawn and his bike have a combined mass of 45.0 kg. Shawn rides his bike 1.80 km in 10.0 min at a constant velocity. What is Shawn's kinetic energy?

Question

jamesj · Answer

The kinetic energy of a system is
$$ KE = \frac{1}{2} mv^2 $$
where m is the mass in kg and v is the velocity in m/s.  The units of energy are Joules, J.

Kinetic Energy is a measurement we make instantaneously.  Hence, the fact he rode for 10 minutes is irrelevant.  This is reflected in the equation above as you can see time doesn't appear.

jamesj · Answer

(But what you will have to do if find his speed in m/s using the distance he covered and the time in which he covered it.)

anonymous · Answer

Okay thanks ^^