Question

После удара клюшкой шайба стала скользить вверх по ледяной горке от её основания, и её вершины имела скорость 5м/с.высота горки 10м.Трение шайбы о лед пренебрежимо мало. Какова скорость шайбы сразу после удала?

Answer 1

По закону сохранения энергии (m*Vнач^2)/2=mgh+(m*vкон^2)/2;
vнач^2=2*9.8*10+25
Vнач=14.86 м/с

Answer 2

Calculation of the initial velocity of the puck

To calculate the initial velocity of the puck after being struck by the stick, we can use the principle of conservation of mechanical energy. The initial mechanical energy of the puck is equal to the sum of its kinetic energy and potential energy.

The potential energy of the puck at the base of the icy slope can be calculated using the formula:

Potential energy = mass × gravity × height

Given that the height of the slope is 10m and the mass of the puck is not provided, we cannot calculate the potential energy directly. However, we can assume that the mass of the puck cancels out when calculating the initial velocity.

The kinetic energy of the puck at the top of the slope can be calculated using the formula:

Kinetic energy = (1/2) × mass × velocity^2

Since the puck is at the top of the slope, its potential energy is zero. Therefore, the initial mechanical energy is equal to the kinetic energy at the top of the slope.

Equating the initial mechanical energy to the kinetic energy, we have:

Potential energy = Kinetic energy

mass × gravity × height = (1/2) × mass × velocity^2

Simplifying the equation, we get:

velocity^2 = 2 × gravity × height

Substituting the given values, we have:

velocity^2 = 2 × 9.8 m/s^2 × 10 m

velocity^2 = 196 m^2/s^2

Taking the square root of both sides, we find:

velocity = √(196 m^2/s^2)

velocity = 14 m/s

Therefore, the initial velocity of the puck immediately after being struck is 14 m/s.