A toddler pushed a 4-kg toy car at a constant speed against a ground frictional force of 8 N. Then, the toddler pushed the toy car with the same force on a marble ground with no frictional
force against the toy car, what is the acceleration (in m/s2) of the toy car?
A. 0
B. 1
C. 2
D. 4

How is acceleration calculated? a. initial velocity - final velocity / timeb. initial velocity + final velocity / timec. final velocity - initial velocity / timed. final velocity / timele select the best answer from the choices provided0oood00save and exitnextmark this and return

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)

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?