Question

На тело массой 6 кг движ. Прямолинейно со скоростью 5 м/с начинает действ постоянная сила направление вдоль скорости движ. Тела. Опр величину этой силы если за 4 с импульс тела уменьш на 80 %

Answer 1

Решение во вложении..!

 

Answer 2

Calculation of the Force Acting on the Body

To calculate the force acting on a body with a mass of 6 kg, moving in a straight line with a velocity of 5 m/s, and experiencing a decrease in momentum by 80% in 4 seconds, we can use the principle of impulse-momentum.

The impulse-momentum principle states that the change in momentum of an object is equal to the force applied to it multiplied by the time interval over which the force acts. Mathematically, it can be expressed as:

Δp = F * Δt

Where: - Δp is the change in momentum - F is the force applied - Δt is the time interval

In this case, the change in momentum is given as a decrease of 80%. We can calculate the change in momentum using the formula:

Δp = m * Δv

Where: - m is the mass of the body - Δv is the change in velocity

Given that the mass of the body is 6 kg and the velocity decreases by 80%, we can calculate the change in momentum:

Δp = 6 kg * (5 m/s * 0.8) = 24 kg·m/s

Now, we can substitute the values into the impulse-momentum equation to find the force:

Δp = F * Δt

24 kg·m/s = F * 4 s

Solving for F:

F = 24 kg·m/s / 4 s = 6 N

Therefore, the magnitude of the force acting on the body is 6 N.