Un proyectil de 2 kg es disparado con una velocidad V formando un cierto ángulo con la horizontal. En el punto máximo de su trayectoria, el proyectil se mueve a razón de 4 m/s y está a 10 m de atura

28. evolution

29. environment, survive, offspring  

explanation:

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.