Question

A girl is riding her bike at as speed of 12 m/s. She weighs 55 kg and her bike weighs 22kg. What is the kinetic energy of the girl and her bike?

Answer 1

Answer:

Kinetic energy of the girl and her bike is 5.544 kJ

Explanation:

Given that a girl is riding bike at speed of 12m/s

Also, mass of Girl is 55kg and mass of bike is 22kg

Let, Total mass of girl and bike be M=22+55=77kg

Now, Kinetic energy is given by K=$\frac{1}{2} Mv^{2}$

Hence, Kinetic energy of the girl and her bike will be

K=$\frac{1}{2} Mv^{2}$

K=$\frac{1}{2} (77)(12)^{2}$

K=5544J

Thus, Kinetic energy of the girl and her bike is 5.544 kJ