Question

Лыжник, спускаясь с горы, проходит 50 м за 5 с. Спустившись с горы и продолжая двигаться, он до полной остановки проходит еще 30 м за 15 с. Найдите среднюю скорость лыжника за все время движения. очень надооо

Answer 1

S:t=v
1)50+30=80(м) всего пути
2)15+5=20(с) всё время
3)80:20=4(м/с)
ответ: средняя скорость лыжника 4 м/с.

Answer 2

50+30=80-всего проехал ; 15+5=20с.-всего в пути ; 80:20=4м/с-средняя скорость.

Answer 3

Calculation of Average Speed

To find the average speed of the skier, we need to calculate the total distance traveled and the total time taken.

The skier first travels 50 meters in 5 seconds while descending the mountain. Then, after reaching the bottom of the mountain, the skier continues moving and covers an additional 30 meters in 15 seconds before coming to a complete stop.

To calculate the total distance traveled, we add the distance covered while descending the mountain (50 meters) to the distance covered after descending (30 meters). This gives us a total distance of 80 meters.

To calculate the total time taken, we add the time taken while descending the mountain (5 seconds) to the time taken after descending (15 seconds). This gives us a total time of 20 seconds.

Now, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Substituting the values, we get:

Average Speed = 80 meters / 20 seconds = 4 meters per second

Therefore, the average speed of the skier for the entire duration of the movement is 4 meters per second.