A weight would be least affected since it would fall striaght down if it was say paper it would go down slower because it has more air resistance due to less weight
Sound waves are a type of classical waves and so they transport only energy without transporting matter through the medium.
Answer:
A. Underground coal mining is dangerous because of possible tunnel collapse and possible methane gas explosions.
Explanation:
Dangers of underground coal mining include asphyxiation, methane gas poisoning, tunnel collapse and explosions of methane gas, a highly flammable gas. Methane explosions occur since this gas is a byproduct of coal. This explosion can cause tunnel collapse.