How to find initial velocity without acceleration

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

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?