What is the kinetic energy of an object with a mass of #6# #kg# that has been in freefall for #8# #s#?
There are a number of ways to do this, but I have outlined one below.
The kinetic energy is
We know how to find the velocity of an object that starts at rest and has been accelerating at a known rate for a known time. We also know how to calculate the kinetic energy of an object if we know its mass and velocity.
The acceleration, of course, is just the acceleration due to gravity. I'll use the value
Not that technically, given we were given the data to only one significant figure, technically the answer is