A 500kg roller coaster moves over the top of a 15m hill while moving at a speed of 4m/s. How fast will the roller coaster be
moving when it reaches the bottom of the hill?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

Which lists the organs in the correct order as food passes from the mouth to anus?