Suppose the force of the air drag on an object is proportional to the speed of the object and in the direction opposite the object's velocity. If you throw an object upward, the magnitude of its acceleration is greatest?A)It is highest at the top of its trajectory
B)It is highest right after the object is released.
C)The acceleration of the object is the same throughout the entire trajectory.

(B)

Explanation:

As the direction of the force and hence the direction of acceleration is opposite to the direction of velocity is the acceleration is decreasing as we go up. thus, the acceleration is maximum at a point when it is just release from the hand.

well clustered together.

points close on a scatter diagram

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =