In a chemical equation, the chemicals that react are considered what

What is binding energy and separation energy

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?