Which energy source is renewable and reliably available always? Options: coal, geothermal, nuclear, wind

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.

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.