Why is the unit of velocity called derived unit?

In your own words, explain the relationship between distance and time

What is the mechanical advantage of a pulley?

while sitting on a tree branch 10 m above the ground, you drop a chestnut. When the chestnut has fallen 2.5 m, you throw a second chestnut straight down.

The actual mechanical advantage of a pulley is 2. The pulley has 3 supporting strings. What is the efficiency of the pulley? 50% 66% 100% 150%

Which of the following contains the largest percentage of the Earth's water?

Why does changing the shape of an object have no effect on the density of that object?

2. Vehicle-braking distance is the distance your vehicle travels after you see a problem before you apply the brakes. A. true B. false

On a sky coaster (human pendulum) that reaches 10 meters from it's equilibrium position, a man of 120 kg is able to reach a maximum speed of 18m/s 14m/s 1200m/s 11m/s

two wires each have a current running through them and are placed next to each other. will one wire be affected by a force from the other? and why?

When using a lever, what is the input force called