2. Susie goes from riding her bike down a hill at 150 m/s to 25m/s going up hill in 5 seconds. What is her acceleration?

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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)