Michael wants to build a new storage shed and is considering clearing some trees from his land to use as lumber. Which of the following is the most sustainable alternative to cutting down his trees? a. Buying wood harvested by sustainable forestry techniques
b. Reusing wood from old construction sites
c. Buying recycled wood processed into lumber boards
d. Buying wood cut from old-growth forests

C

Explanation:

In answer A, if Michael is building the shed from the sustainable forestry techniques, it is still cutting down trees. In answer B, to reuse wood from old construction sites, could be useful but at the same time could be dangerous because the wood could have been damaged, meaning the shed could collapse during or after construction meaning you have to start all over again. In answer D, that is the worst answer, because the forest has stood for a long time and Michael would be supporting cutting down old-growth forests. Answer C would be the safest and most sustainable alternative.

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j

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explanation; google