# What is the kinetic energy of an object with a mass of 15 kg that has been in freefall for 2 s?

After free fall of 2s it will gain velocity $v = 0 + g \times t = 9.8 \times 2 \frac{m}{s} = 19.6 \frac{m}{s}$
Hence the kinetic energy gained =$\frac{1}{2} \times m \times {v}^{2} = \frac{1}{2} \times 15 \times {\left(19.6\right)}^{2} J = 2881.2 J$