Aball is projected upward at time t = 0.0 s, from a point on a roof 70 m above the ground. the ball rises, then falls and strikes the ground. the initial velocity of the ball is what is the velocity of the ball when it is above the ground? −89 m/s − 72 m/s − 36 m/s − 107 m/s − 54 m/s

Which property of fossils allow scientists to determine the relative rock ages..

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.