A particle undergoes two displacements. The first has a magnitude of 199 cm and makes an angle of 149 degrees with a positive x axis. The resultant displacement has a magnitude of 115 cm and is directed at an angle of 32.1 degrees to the positive x axis. Find the magnitude of the second displacement. Answer in units of cm.

there are no contact forces mentioned on the list of choices that you've provided.

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 =