A bus travels 30km in 1/2h. What is it's average speed in km/h

A car in a movie moving at 20 m/s flies off a cliff that is 74.3m tall. How long is the car in the air for and how far does the car travel before it hits the ground below?

How many valance electron do atoms need to be stable

A rock is thrown down with an intial speed of 10.0 m/s from a bridge in the water. it takes 2.75 s for the rock to hit the water? find the speed of the rock as it hits the water, and how high is the bridge above the water?

Two small charged spheres are 6.52 cm apart. they are moved, and the force each exerts on the other is found to have tripled. how far apart are they now?

What are equations used for friction

A certain rock contains large jagged pieces of other rocks cemented by fine particles what type of rock is this explain

Could a nucleus that has one proton but no neutrons exist?

Which physical quantities has the unit kg·m·s-1?

Can an object travel at the speed of light? Why or why not?

Determine the amount of potential energy of a 5 Newton's book that is moved to three different shelves on a bookcase. The height of the shelves is 1.0 meter, 1.5 meter, and 2.0 meter