If 10 waves occupy 15 cm what is the wavelength?

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up