How could you figure out how fast you can run

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?