Question

СРОЧНО ОСТАЛОСЬ МАЛО ВРЕМЕНИ двигаясь со скоростью 36 км/ч мотоциклист преодолел расстояние за 30 мин определите сколько времени ему понадобиться на обратный путь если он будет двигаться со скоростью 9 м/с​

Answer 1

Дано:

v1= 36 кс/год= 10 м/с

t1= 30 хв= 1800 с

l1= l2

v2= 9 м/с

______________

t2-?

Розв'язок:

l1=l2

l= v×t

$v1×t1=v2×t2$

З цієї формули знайдемо t2:

$t2 = \frac{v1 \times t1}{v2}$

$t2 = \frac{10 \times 1800}{9} = 2000c$

Відповідь: t2= 2×10³ с

Answer 2

Problem Analysis

The problem states that a motorcyclist traveled a certain distance at a speed of 36 km/h and took 30 minutes to complete the journey. The task is to determine how much time it will take for the motorcyclist to return if they travel at a speed of 9 m/s.

Solution

To solve this problem, we need to convert the speed of the motorcyclist to a consistent unit before calculating the time for the return journey.

Given: - Speed of the motorcyclist = 36 km/h - Time taken for the initial journey = 30 minutes

Conversion of Speed

To convert the speed from km/h to m/s, we can use the following conversion factor: 1 km/h = 1000 m/3600 s = 10/36 m/s

Converting the speed of the motorcyclist: 36 km/h * (10/36) m/s = 10 m/s

Calculation of Time for the Return Journey

Now that we have the speed of the motorcyclist in m/s, we can calculate the time for the return journey.

Given: - Speed of the motorcyclist for the return journey = 9 m/s

To calculate the time for the return journey, we can use the formula: Time = Distance / Speed

Since the distance for the return journey is the same as the initial journey, we can use the time taken for the initial journey to calculate the time for the return journey.

Time for the return journey = Time taken for the initial journey = 30 minutes

Answer

The motorcyclist will take 30 minutes for the return journey if they travel at a speed of 9 m/s.

Note: The conversion factor and calculations are based on the given information and assumptions.