91影视

The energy possessed by an object by virtue of its motion is known as kinetic energy.

The energy stored in an object by virtue of its position above the surface of the earth is known as gravitational potential energy.

When friction is neglected, the skier鈥檚 initial gravitational potential energy at the top gets converted into kinetic energy at the bottom. It follows the law of conservation of energy.

According to an analysis, the frictional force (f) on a steeper slope has a lesser magnitude than on a flatter slope. The normal force (N) acting upward on the skier is proportional to the friction\(\left( {f = \mu N} \right)\).

Consider an extreme case where the hill is almost vertical. The contact force between the skis and the hill is zero; hence, the friction is zero.

Thus, the skier will be coasting with a great speed in option (c) because the steepness of the hill, in this case, is the highest with the least friction.