Holiday assignment physics why does accderation due to gravity varies .A Stone is Shot out of from a catapult with an initial velocity of 30m/s at an elevation of 60⁰ find 1.time of flight 2.maximum height 3.range​

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)