Two students are playing hockey with 0.4-n wad of paper. one student hits the wad and it slides across his desk, slowing down at a rate of 0.6 m/s/s. find the coefficient of kinetic friction between the wad and the desk?

0.06

Explanation:

On a level surface, normal force = weight.

Sum of the forces in the x direction:

∑F = ma

Nμ = ma

mgμ = ma

gμ = a

μ = a/g

μ = (0.6 m/s²) / (9.8 m/s²)

μ = 0.06

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.