A single fixed pulley is neither a force multiplier nor a distance multiplier. Why is it still used?

Aball is thrown straight up into the air with a speed of 21 m/s. if the ball has a mass of 0.1 kg, how high does the ball go? acceleration due to gravity is g = 9.8 m/s^2. a. 22.5 m b. 20.0 m c. 25.0 m d. 17.5 m

What is the temperature in degrees celsius of a substance with a tempature of 49k

How do we measure or think of speed in the united states?