What is a matrix and reinforcement in the simplest explanation.

Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)

If steel is more dense that lake water, why can a boat float

What kind of simple machine is a catapult?