What is the kinetic energy of an object with a mass of #3 kg# that has been in freefall for # 7 s#?
7kJ of energy
The acceleration on the object is g, or 9.8m/s (assuming no air resistance) This number is a constant that applies to all objects close to the Earth.
Use the equation:
In this case, the initial velocity is zero (The object is dropped, not thrown downward) So:
Now for kinetic energy =
Which is about