F14–15. the 2-kg collar is given a downward velocity of 4 m> s when it is at a. if the spring has an unstretched length of 1 m and a stiffness of k = 30 n> m, determine the velocity of the collar at s = 1 m.

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.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

the independent variable, or the one that is intentionally manipulated is the speed.