There are MANY of them, but I shall name the three that I find dangerous.
1- We would run out of energy, which could happen eventually if we do not use this resource wisely.
2- We could get a-lot of diseases/illnesses because WE ourselves are made of electricity, and if we take up too much, we could get sick.
3- We would rely on electricity too much, and later if it runs out, we would die....literally. <span />
The ball can't reach the speed of 20 m/s in two seconds, unless you THROW it down from the window with a little bit of initial speed. If you just drop it, then the highest speed it can have after two seconds is 19.6 m/s .
If an object starts from rest and its speed after 2 seconds is 20 m/s, then its acceleration is 20/2 = 10 m/s^2 .
(Gravity on Earth is only 9.8 m/s^2.)
The body of a porter carrying load on head on a level road uses more energy than is required when the porter is resting completely. In this way the porter is doing some work.
However, when we think of theoretical definition of work, there is no force resisting the horizontal movement of the load when carried on a level road, and therefore there is no work done when a porter carrying a load on his head walk along a level road.
When the porter is going down the stairs the gravitational energy acting on the load is assisting the downward movement of the load. In this way energy is released by downward movement of the load. Thus the porter is doing negative work on the load.
The correct answer is C) Through Socialization. Hope this helps.
