Question

Помогите пожалуйста, очень срочно надо) даю 20 балловчерез 20 с швидкість тіла стала 36 км/год.Якою вона була,якщо прискорення тіла 0,5 м/с ²​

Answer 1

Ответ:

26 км/час

Объяснение:

Ускорение a = (V2 - V1)/ t

V2 =  36 км/час

a = 0.5 м/с2

t = 20 с

0,5 = (36 - V1)/20

10 = 36 - V1

V 1 = 26 км/час

Answer 2

Calculating the Initial Speed of the Object

To calculate the initial speed of the object, we can use the following kinematic equation:

v = u + at

Where: - v = final velocity (36 km/h) - u = initial velocity (unknown) - a = acceleration (0.5 m/s²) - t = time (20 s)

First, we need to convert the final velocity from km/h to m/s to ensure consistent units for the calculation.

Conversion of Final Velocity from km/h to m/s

To convert the final velocity from km/h to m/s, we use the following conversion factor:

1 km/h = 0.277778 m/s

So, the final velocity of 36 km/h is equal to:

36 km/h * 0.277778 m/s = 10 m/s

Now that we have the final velocity in m/s, we can proceed to calculate the initial velocity using the kinematic equation.

Calculation of Initial Velocity

Using the kinematic equation v = u + at, we can rearrange it to solve for the initial velocity (u):

u = v - at

Substituting the known values: - v = 10 m/s - a = 0.5 m/s² - t = 20 s

We can calculate the initial velocity (u):

u = 10 m/s - (0.5 m/s² * 20 s) u = 10 m/s - 10 m/s u = 0 m/s

Therefore, the initial speed of the object was 0 m/s.

Conclusion

The initial speed of the object, given the final velocity of 36 km/h and an acceleration of 0.5 m/s² over a time of 20 seconds, was found to be 0 m/s.