Question

I started to solve this problem but I’m not sure on what to do next.

Answer 1

3408.81 kg

Explanation:

Given:

v = 111 m/s

Ek = 21000000 J

We have that the formula for kinetic energy is as follows:

`E_k=(1)/(2)\cdot m\cdot v^2`

We substitute the values given in the exercise and solve for m (mass)

`\begin{gathered} 21000000=(1)/(2)\cdot m\cdot111^2 \\ m=(21000000\cdot2)/(111^2) \\ m=3408.81\text{ kg} \end{gathered}`

The mass of the helicopter is 3408.81 kilograms.