Q1) An average force of 50.0 N is exerted on a 4.0-kg cart for 2.0 seconds. a. What is the impulse?
b. What is the change in momentum?
c. What is the mass's change in velocity?

From 0 to 5 seconds john pushed a box 5 meters. from 5 to 10 seconds, paul pushed the same box another 5 meters. who did more work? a. john b. paul c. john and paul did the same amount of work.

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)

If anyone who can me with this hw? i would really appreciate it