The first one,second one and the forth one are correct
Answer:
96.5 km/h
Explanation:
The average velocity of the train is given by:

where
d is the displacement
t is the time taken
For this train, we have:
d = 55 km south (displacement is a vector, so we must also consider the direction)

Substituting into the equation, we find the average velocity:

The angle theta of the spring is 31 degrees. To solve for this, show the equation which is equal to the 10lb ball. With this, the unknown will be the angle. Then transpose/transfer the terms in order to isolate the variable for the angle. First solve for s, then solve for angle theta. You will come up with s = .5849 ft and angle theta = 31.2629 or 31 degrees. Hope this helps.
6. gas
7. liquid
8. gas
9. does not change
10. boiling point
Answer:
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Explanation: