For a free falling object weighing 3kg, what is the object's velocity 2 s after its release?

from equation 4.9 v = at = 9.8 m/s2 * 2 s =20 m/s.

Explanation:

first one is the correct answer

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.