Acar moved 60 km east and 90 km west. what is the displacement? me 

assume the east-west direction along the x-axis such that east lies in positive x-direction and west lie in negative Y-direction.

In unit-vector notation , individual displacement can be represented as

A = displacement of car in east direction = 60 i

B = displacement of car in west direction = - 90 i

D = total displacement of the car

Total displacement of the car is given as

D = A + B

inserting the values

D = 60 i + (- 90 i)

D = - 30 i

negative sign indicates the direction in west

hence net displacement is 30 km in west direction

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by