You are a police officer who arrives at a scene of an accident. The only evidence that you have is the skid mark left on the road. Fortunately no one gets hurt. The driver indicates that he was not speeding. How could you be sure that he was speeding or not. Explain how you would
calculate and analyze his speed. You can use the formula : W = change in kinetic energy (energy- work theorem).

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

Ineed asap! list 3 examples in which friction us or makes things easier in our daily life. explain the effect of friction for each. *make sure you explain the effect of friction for each example! *

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.