Question

стрекоза и муха двигаются по прямой, стрекоза догоняет муху их скорости равны,1,2м/с-стрекоза, муха -30см/с через сколько секунд расстояние между насекомыми сократится с 6,5м. до 20см.?

Answer 1

6,5м=650 см
650-20=630 см
1,2 м/c=120 см/с
120-30=90 cм/c
630/90=7 c
ответ 7 с

Answer 2

Calculation of Time to Reduce Distance between Dragonfly and Fly

To calculate the time it takes for the distance between the dragonfly and the fly to reduce from 6.5 meters to 20 centimeters, we can use the formula:

Time = Distance / Relative Speed

Given that the dragonfly's speed is 1.2 m/s and the fly's speed is 0.3 m/s, we can calculate the time as follows:

Time = (6.5 m - 0.2 m) / (1.2 m/s - 0.3 m/s)

Simplifying the equation:

Time = 6.3 m / 0.9 m/s

Calculating the result:

Time ≈ 7 seconds

Therefore, it will take approximately 7 seconds for the distance between the dragonfly and the fly to reduce from 6.5 meters to 20 centimeters.

Please note that the calculation assumes constant speeds for both the dragonfly and the fly, and no other factors affecting their movement are considered.