What is the acceleration of an airplane maintaining a constant speed of 67.7 m/s?

Zero

Explanation:

The acceleration of the plane is given by:

where

is the change in velocity

is the time taken

In this problem, we are told that the airplane is traveling at constant speed, so (assuming it is traveling in a straight line*), its velocity is not changing. Therefore, and the acceleration is zero.

*if the airplane is changing direction, then its velocity is changing (because velocity is a vector), so the acceleration in this case would not be zero.

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.