Astunt car with a mass of 1,000 kilograms crashes into a tree on a movie set. during the collision, the acceleration of the car was 3 meters/second2. what was the force of impact of the collision on the car?

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

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.