When a rock is thrown at sea, will it continue to pick up speed all the way to the bottom, however deep the water is?

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?