All that business about the crane and the rope and the falling
is only there to confuse us.
The piano ended up 5 meters above the ground.
Potential energy = (mass) (gravity) (height)
= (200 kg) (9.81 m/s²) (5 m)
= (200 · 9.81 · 5) (kg-m²/s²)
= 9,810 joules .
The answer is Column, however if you want to know the scientific word for it, it is also known as a group
(extra fact, a row is called a period)
The centripetal force is provided by the friction between the tyres and the ground. That's why a car will slip on ice, because there is less friction.
To solve this problem it is necessary to apply the concepts related to the Conservation of Energy, for which it is necessary that any decrease made through the potential energy, is equivalent to the gain given in the kinetic energy or vice versa.
Mathematically this can be expressed as

Since there is no final potential energy (the height is zero), and the initial potential energy is equivalent to the work done we have to






Therefore the non-conservative work was done on the boy is 1.4kJ
When we pick snowball from our bare hand then thermal energy (heat) will flow from our hand to snow. It is because heat always flows from Hot body to Cold body.
Hope this helps!