Carlos listed some advantages and disadvantages of using nonrenewable resources. which best describes carlos's error? coal is not plentiful anywhere. coal generates very little energy. ores do not make many useful products. ores must be processed.

The correct answer to your problem is D. Ores must be processed to make many useful products.

Coal generates very little energy is wrong.

Explanation:

Coal was a very useful form of energy in the earlier centuries, virtually everything man did then was coal powered ranging from coal powered trains, electricity generation , heating up homes in winter, powering of large ships were all powered by coal.

The major challenges with coal is that it is non renewable form of energy and also it releases some green house gases that are harmful to our environment, which gives rise to global warming.

the velocity you are looking for is made up of two parts: horizontally velocity, vh, and its vertical velocity, vv. the actual velocity of the ball will be these two parts added together, and because velocity is a vector then they will need to be added vectorially.  

neglecting air resistance etc etc.,  

the horizontal velocity component will be constant (because there is no accelerating force in the horizontal direction.  

vh = 8 ms-1  

the vertical velocity component has an accelerating force: 'g'.  

using v = u +at where a = g = 9.81 ms-2.  

the vertical component of velocity, vv = 0 + gt = vv =9.81 x 2  

vv = 19.62 ms-1 . the zero appears because the virtical component of velocity at time t=0 is zero. remember, the ball was thrown horizontally.  

how fast it will be moving (it actual path (being a parabola )) will be the vector sum of these two.  

adding vectorally gives: -  

v = sqr root (8^2 + 19.62^2) = sqr root(64+384.9) = 21.18 or 21.2 ms-1

1 is a answer of a question