Astone is dropped at t = 0. a second stone, with 5 times the mass of the first, is dropped from the same point at t = 180 ms. (a) how far below the release point is the center of mass of the two stones at t = 420 ms? (neither stone has yet reached the ground.) (b) how fast is the center of mass of the two-stone system moving at that time?

a. 0.379m

b.2.646 m/s

Step-by-step explanation:

Let mass of first stone=

Mass of second stone=

Both stones are in  free fall.

The first one free fall during

The second one free fall during

Both stone start motion  at the same point with initial velocity=0

a.We have to find the  distance between the release point  and  below the release point where is the center of mass of the two stones.

Substitute the values

Hence, center of mass  from the release point at distance=0.379 m

b.We have to find

Now,

27

step-by-step explanation:

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour