Por que los cambios de la luna?

The Moon appears changes shape according to how much of it you can see (as long as it's not cloudy!) and that depends on how much of the bit you can see is facing the Sun. The Sun's light reflects off the Moon enabling you to see it.

La Luna parece cambiar de forma según la cantidad que puedas ver (¡siempre y cuando no esté nublado!) Y eso depende de cuánto de la parte que puedas ver esté orientada hacia el Sol. La luz del Sol se refleja en la Luna y te permite verla.

Explanation:

Hope it is helpful to....

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.