The speed of a sound wave changes from 6,100 m/s to 1,484 m/s and then to 344 m/s as it passes through different materials. Which of the following sequences could produce these changes in speed?

Air, water, steel.
Steel, water, air.
Steel, air, water.
Water, steel, air.

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25? , b) el tiempo que el balón permanece en el aire.