Size and direction of the change in velocity

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SUMMARY

The discussion focuses on calculating the size and direction of changes in velocity for three scenarios involving motion in the west and east directions. For the first scenario, the change in velocity from 5 m/s west to 10 m/s west results in a change of 5 m/s west. The second scenario, changing from 10 m/s west to 5 m/s west, also results in a change of 5 m/s but in the opposite direction (east). The third scenario, changing from 5 m/s west to 10 m/s east, results in a total change of 15 m/s east, as the velocities are additive when they are in opposite directions.

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coconut88
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Homework Statement


Find Size and direction of the change in velocity:

a)5m/s west to 10 m/s west

b)10m/s west to 5m/s west

c)5m/s west to 10m/s east

Homework Equations





The Attempt at a Solution



a)10-5= 5 west

b)5-10=-5 because there isn't size wihe negitve the answer will be 5 to oppicite direction (east)

C) My problem here the book says the answer will be 15 m/s east but I don't how it come up with it ?

can you explain it for me ?
 
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coconut88 said:

Homework Statement


Find Size and direction of the change in velocity:

a)5m/s west to 10 m/s west

b)10m/s west to 5m/s west

c)5m/s west to 10m/s east

Homework Equations





The Attempt at a Solution



a)10-5= 5 west

b)5-10=-5 because there isn't size wihe negitve the answer will be 5 to oppicite direction (east)

C) My problem here the book says the answer will be 15 m/s east but I don't how it come up with it ?

can you explain it for me ?

5m/s west is equal to -5m/s east.
 
Think you FedEx
5m/s west to 10m/s east = 15 m/s east here my problem
From where I can get 15? why does the book add them?even I know that if I want to know finall velocity v2-v1 but here v2+v1 why ?
 
coconut88 said:
Think you FedEx
5m/s west to 10m/s east = 15 m/s east here my problem
From where I can get 15? why does the book add them?even I know that if I want to know finall velocity v2-v1 but here v2+v1 why ?

(10m/s east) - (5 m/s west) = (10 m/s east) - (- 5m/s east) = 15 m/s east
 

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