A ball with a mass of M=5.00kg is attached to 30.0cm long cord and it is initially at rest with the string horizontal as shown below. When the
ball is released, it hits a block with mass m=2.50kg that is at the edge of
a table. After the collision, the ball bounces back with a speed of
1.50m/s, and the block lands 4.00m from the edge of the table.
a) Find the speed of the ball right before its collision with the block.
(5 points)
b) With what velocity does the block leave the table? (5 points)
c) Find the height of the table. (5 points)
d) With what speed does the ball land on the floor? (5 points)

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

seeing the graph would

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 =