What is the speed of light in a vacuum? 300 meters per second 299,792,458 miles per hour 300,000 miles per hour 299,792,458 meters per second

Can anybody me with this? ? (picture included.)

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 ?

Madison pushes with a 210-n horizontal force on a 24-kg crate of coffee resting on a warehouse floor. the force of friction on the crate is 74 n. what is the acceleration?