Two small, identical conducting spheres repel each other with a force of 0.025 N when they are 0.55 m apart. After a conducting wire is connected between the spheres and then removed, they repel each other with a force of 0.070 N. What is the original charge on each sphere

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?