Acar can be braked to a stop from the autobahn-like speed of 206 km/h in 190 m. assuming the acceleration is constant, find its magnitude in (a) si units and (b) in terms of g. (c) how much time tb is required for the braking? your reaction time tr is the time you require to perceive an emergency, move your foot to the brake, and begin the braking. if tr = 400 ms, then (d) what is the ratio tb/tr?

Explanation:

We can use the following formula, from kinematics:

where is the final speed, is the initial speed, a is the acceleration and d the distance traveled.

Knowing that the final speed is zero, and the initial speed is

we obtain

Now, knowing that

then

We can use the following formula

so

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sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.