Answer:
2.24kJ
Explanation:
Kinetic energy is the energy that a object possesses due to its motion.
Let kinetic Energy (KE),
Here both the Bicycle and the girl is travelling at the given speed , therefore we have to consider the total mass
according ti the definition ,
[tex]KE=\frac{1}{2}*mass*velocity^{2} \\=\frac{1}{2}*(50+20)kg*(8ms^{-1} )^{2}\\ =2240J\\=2.24kJ[/tex]
