Aperson paddles down river at an average speed of 4km

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

Carbon 14 is a naturally occurring stable