Question

Ребяят, помогите пожалуйста...Была контрольная, нифига не решили препод дал домой, но условий нет, лишь дано.t1=1/3tU1=54 м/сt2=2/3t U2=36 км/чНайти:Uср

Answer 1

Vcp = S / t = (S1+S2) / t = (v1t1 + v2t2) / t
vcp = (v1*1/3 t + v2 * 2/3 t) / t = 1/3 v1 + 2/3 v2
vcp = 1/3 * 54 + 2/3 * 36 = 42 (км/ч)

Первая скорость наверно все-таки в км/ч, иначе ерунда какая-то получается

Answer 2

Problem Statement

You have been given a problem statement without any specific conditions. The problem involves finding the average velocity, denoted as Uср, given the initial velocity U1, final velocity U2, and the time interval t.

Solution

To find the average velocity, we need to calculate the total displacement and divide it by the total time taken. The formula for average velocity is:

Uср = (displacement) / (time)

Let's calculate the displacement first.

Calculating Displacement

The displacement can be calculated by subtracting the initial position from the final position. However, since we don't have any position information, we can use the formula:

displacement = (final velocity - initial velocity) * time

Given: - Initial velocity, U1 = 54 m/s - Final velocity, U2 = 36 km/h - Time interval, t = ?

We need to convert the final velocity from km/h to m/s to ensure consistent units.

1 km/h = 1000 m/3600 s = 5/18 m/s

So, the final velocity U2 in m/s is:

U2 = 36 km/h * (5/18 m/s) = 10 m/s

Now, we can calculate the displacement using the formula:

displacement = (U2 - U1) * t

Substituting the given values:

displacement = (10 m/s - 54 m/s) * t

Simplifying:

displacement = -44 m/s * t

Calculating Average Velocity

Now that we have the displacement, we can calculate the average velocity using the formula:

Uср = displacement / time

Substituting the value of displacement:

Uср = (-44 m/s * t) / t

Simplifying:

Uср = -44 m/s

Answer

The average velocity, Uср, is -44 m/s.

Please note that the negative sign indicates that the velocity is in the opposite direction of the initial velocity.