Question 3 1 pts
Two students are doing The Cart and the Brick Lab. The cart has a mass of 8.8 kg cart
and is initially moving at 7.2 m/s. A brick of mass 5.6 kg is then dropped on top of the
cart and the two roll away together. Calculate the final velocity of the brick and cart, and
then round your answer to the tenths place.

i already answered it by 34/s

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 =

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.