You toss a ball straight up at 6.8 m/s ; it leaves your hand at 2.0 m above the floor. suppose you had tossed a second ball straight down at 6.8 m/s (from the same place 2.0 m above the floor). when would the second ball hit the floor?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

What is a good example of instantaneous speed

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?