Joe throws a ball straight down a 100 m building with a velocity of 5 m/s. How long does it take the ball to reach the ground?

If a simple machine reduces the strength of a force, what must be increased?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9