Question

По реке , скорость течения которой 2 км/ч , плывет бревно. По бревну в том же направлении бежит мышонок. С какой скоростью относительно брёвна бежит мышонок , если его скорость относительно берега 2, 5 км/ч

Answer 1

Скорость относительно бревна равна v=2.5-2=0.5 м/с.

Answer 2

Problem Analysis

We are given that a log is floating in a river with a current speed of 2 km/h. A mouse is running on the log in the same direction. The mouse's speed relative to the shore is given as 2.5 km/h. We need to determine the speed of the mouse relative to the log.

Solution

To find the speed of the mouse relative to the log, we need to subtract the speed of the log from the speed of the mouse relative to the shore.

Let's calculate the speed of the mouse relative to the log:

Speed of the mouse relative to the log = Speed of the mouse relative to the shore - Speed of the log

Given: - Speed of the mouse relative to the shore = 2.5 km/h - Speed of the log = 2 km/h

Substituting the values into the formula:

Speed of the mouse relative to the log = 2.5 km/h - 2 km/h

Calculating the difference:

Speed of the mouse relative to the log = 0.5 km/h

Therefore, the mouse is running on the log with a speed of 0.5 km/h relative to the log.

Answer

The mouse is running on the log with a speed of 0.5 km/h relative to the log.