How much force is needed to stop a 50 kg gymnast if he decelerates at 25 m/s^2

in net forces

What is the difference between electrically neutral objects and electrically charged objects

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

How is the gravitational force related to the distance between two objects?