The blue dot in front of the mirror is the focal point of the mirror. Move the light bulb on the left around. What is always true about the ray that is reflected from the parallel ray?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

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 ?