a 1.0 kg ball is dropped from a 20 m tall building. how long will it take for the ball to hit the ground?

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Suppose that a cylindrical tank 6 meters high with a radius of 2 meters is filled to the rim with water. the tank is buried so that the top of the tank is 1 meter below ground level. the space above the tank is not filled with water. calculate how much work needs to be done by a pump to pump the water out of the tank up to ground level. (the water weighs 9,800 newtons per cubic meter.)