Question

Хелп! Санки, що рухалися льодяною горизонтальною поверхнею, проїхали до зупинки 25 м. Визначити їхню початкову швидкість, якщо коефіцієнт тертя ковзання дорівнює 0,05. Санки, что двигались по льду горизонтально, проехали до остановки 25 м. Найдите изначальную скорость, если коефицтент трения равен 0,05.

Answer 1

Санки, що рухалися льодяною горизонтальною поверхнею, проїхали до зупинки 25 м. Визначити їхню початкову швидкість, якщо коефіцієнт тертя ковзання дорівнює 0,05.

Answer 2

Calculating Initial Speed of Sleds on Ice

To calculate the initial speed of the sleds, we can use the equation for the work done by friction. The work done by friction is equal to the change in kinetic energy of the sleds. The equation for the work done by friction is:

Work done by friction = Force of friction × Distance

The force of friction can be calculated using the equation:

Force of friction = Coefficient of friction × Normal force

Where the normal force is the force exerted by the surface to support the weight of the object. On a horizontal surface, the normal force is equal to the weight of the object.

Given: - Distance traveled by the sleds, d = 25 m - Coefficient of friction, μ = 0.05

We can use the work-energy principle to find the initial speed of the sleds.

Calculating the Work Done by Friction

The work done by friction can be calculated using the formula:

Work = Change in kinetic energy

The change in kinetic energy can be expressed as:

Change in kinetic energy = (1/2) × m × (v^2 - u^2)

Where: - m is the mass of the sleds - v is the final speed of the sleds - u is the initial speed of the sleds

Solving for Initial Speed

By equating the work done by friction to the change in kinetic energy, we can solve for the initial speed of the sleds.

Let's calculate the initial speed of the sleds using the given information.