Afew years ago, serena williams dived to hit a tennis ball right after it bounced off the ground. the ball bounced on the ground 11.5 m from the net, and after serena hit the ball it flew over the 0.950 m high net and bounced in her opponent's court about 1.05 s after she hit it. if there had been no gravity, the ball would have been 1.73 m higher than the net when it crossed over.. how fast was the ball moving when it left serena\'s racket? ignore any effects from ball spin and air resistance.

the answer is a)

mark brainliest

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 =

prndulum needs thread, weight clock to time swings