A 43kg rock is dropped from a height of 35m. If there was no air resistance, what will the velocity be of the rock just before it hits the ground?

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?

Acar going 30 m/s to 70 m/s in 10 seconds calculate the acceleration of the car

What was the approximate temperature of the universe at an age of 1015 s?