As you walk to class with a constant speed of 1.75 m/s, you are moving in a direction that is 18.0° north of east. How much time does it take to change your displacement by (a) 20.0 m east or (b) 30.0 m north?
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The speed of yours is: .
The angle is north of east.
The x component of the velocity is:
The y component is:
A displacement of 20 m east will cost a time of,
So, it will take to displace 20 m towards east.