If jill starts out at 20 m/s, and in 10 s speeds up to 40 m/s, what is her acceleration?
o 3 m/s2
o 200 m/s2
02 m/s2
01 m/s2

Explanation:

The acceleration of an object (or a person, as in this case) is given by

where

v is the final velocity

u is the initial velocity

t is the time interval

In this problem,

u = 20 m/s

v = 40 m/s

t = 10 s

Therefore Jill's acceleration is

The acceleration of Jill is if he starts out at the velocity 20 m/s and in 10 s speeds up to 40 m/s.

From given, we came to know that the Jill starts out at 20 m/s, and in 10 s speeds up to 40 m/s, to find acceleration of Jill, we know that acceleration is ratio of velocity to time change.

The acceleration is given by the formula:

We know that change in velocity as 20 m/s to 40.0 m/s and change time as 10 s.

Thus, acceleration of Jill will be

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

it is b. absorbs thermal energy