Aspacecraft is launched from the surface of the earth with a velocity of 0.600c at an angle of 50.0 above the horizontal, positive x-axis. another spacecraft is moving past with a velocity of 0.700c in the negative x direction. determine the magnitude and direction of the velocity of the first spacecraft

i would say

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 =

at right angles to each other

friction

explanation:

they us to move forward and backwards