A bullet is fired horizontally from a 20m tall building. How long does it take to hit the ground

t = 2.02 secs

Explanation:

Given the following data;

Height = 20m

We know that acceleration due to gravity, g = 9.8m/s²

To find the time, we would use the formula for maximum height;

H = ½gt²

Substituting into the equation, we have;

20 = ½*9.8t²

20 = 4.9t²

t² = 20/4.9

t² = 4.082

Taking the square root of both sides, we have;

t = 2.02 secs

Therefore, it would take the bullet 2.02 seconds to hit the ground.

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.