Suppose the gravitational acceleration on a certain planet is only 4.0 m/s2. a space explorer standing on this planet throws a ball straight upward with an initial velocity of 24 m/s. assume that upward direction is positive. what is the velocity of the ball 3 seconds after it is thrown?

Atypical jetliner lands at a speed of 146 mi/h and decelerates at the rate of (10.4 mi/h)/s. if the jetliner travels at a constant speed of 146 mi/h for 1.5 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?