On the balcony, blowing the classmates happy in the bubbles is really a conjunction

Plants have a tendency to grow towards the light, so you can change the position of the flowers, move the original side to the light side to the inside, and move the inside side to the outside. Then use a bamboo pole or stick or something to fix the flower and support it.

The students on the bathroom door to sit in the bathroom door, there is a crowded, fell to the security incident, a serious impact on the other

I bought it again, and it was also terrible to be blown away by the earthquake. If an earthquake comes, you will definitely run for your life first, nothing is more important than life.

It is not recommended that although it is summer, the temperature difference between day and night is large, which is also a practice that is easy to catch a cold.

On the balcony with a height of h from the ground, throw the ball at a rate v, and let the ball land at a velocity of v'According to the law of conservation of mechanical energy, 1 2* mv 2+mgh=1 2* mv'2, so v'2=v 2+2gh, because h and v are the same in the question, so the velocity of the three balls when they land is the same.