A ball is thrown upwards from a height of 15 m off the ground with a speed of 12 m / s The ball is subject to a gravitational force that produces a downwards acceleration of 9.8m / (s ^ 2) Given that (d ^ 2 * h)/(d * t ^ 2) = - 9.8 determine how many seconds it will take from when the ball is thrown until it hits the ground. Round your answer to one decimal place.

NASA has fired a rocket straight up into the air from ground level with an unknown initial velocity. It reaches a maximum height of 164,000 feet. This happened in Cape Canaveral therefore the rocket is under the acceleration of Earth's gavity in which we all know is -32 ft/sec/sec.                                           Please round your answers to two decimal places. a). Find the time it takes for the rocket to reach maximum height. b). find the initial velocity necessary to reach that height.

A student kicks a football vertically upwards, causing the football to reach a maximum height of 40.0m before falling back to the ground. Determine all unknowns and answer the following questions. Neglect drag and the initial height and horizontal motion of the football. With what speed was the football kicked? unit What was the football's total flight time? unit