A2200 kg car traveling at 8.7 m/s collides with a 2750 kg car that is initially at rest at the stoplight. the cars stick together and move 2.00 m before friction causes them to stop.

determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and that all wheels on both cars lock at the time of impact.

To solve this problem we will apply three conceps that will take us to the coefficient of dynamic friction. We will start from the momentum conservation theorem to find the final velocity of the bodies. From this speed we will use the linear motion kinematic equations to find the acceleration.

Finally by equilibrium of Forces, the friction force must be equal to the force caused by the acceleration in the mass of the bodies. Let's start

By Conservation of momentum

So combined cars velocity after impact = 3.86 m/s

Applying the cinematic equations we have that the acceleration is

Replacing,

Now by equilibrium in force we have that,

Therefore the coefficient of kinetic friction between the cars and the road is 0.379

answer: 0.20

explanation: this can only be the answew because all the other measuremnets are not close

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.