A father racing his son has 1/3 the kinetic energy of the son, who has 1/3 the mass of the father. The father speeds up by 1.7 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son? Please help !!

These models show the electron structures of two different nonmetal elements. which element is likely more reactive, and why? element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table. element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table. element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons. element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?