A500 kg train car(car1) is traveling at 25 meters per second when it hits and attaches to another 750 kg train car(car2) that is at rest. find the resulting velocity of both train cars after they hit and the momentum of the train cars before and after they attached

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 .

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

a is the best answer your welcome