A hockey player stands on the ice as an opposing player skates by with a puck, moving at uniform speed of 12m/s. Three seconds after this, the first player decides to chase him down and body check this guy. If he accelerates at 4 m/s2 :

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)