Question

What is the kinetic energy of an object with a mass of `1 kg` that has been in freefall for `1 s`?

Answer 1

`48.02` Joules

Explanation:

Kinetic energy (`KE`) is given by `(m.v^2)/2`, where `m` is mass in kg and `v` is velocity in meters. As the object of mass `1` kg undergoes free fall for `1` second, its velocity at the end of one second is given by `v=g*t`, where `g` is `9.8` `m/s^2` i.e.

`v=9.8*1=9.8` `m/s`, and hence `KE` is given by

`1/2*9.8^2 = 48.02` Joules.