two identical carts travel toward each other at the same speed and collide with each other. what can we conclude?

Rohit is trying to tune an instrument

Afrequency generator sends a 550 hz sound wave through both water and ice. what is the difference in wavelength between the wave produced in ice and the wave produced in water?

If there's a small amount of friction between two surfaces, the result could be select all that applya. no movement b. heatc. a little bit of movementd. sliding around