AP Physics 1 Question 189: Answer and Explanation

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Question: 189

9. The x-component of vector A is -42, and the angle it makes with the positive x-direction is 130°. What is the y-component of vector A ?

  • A. -65.3
  • B. -50.1
  • C. 50.1
  • D. 65.3

Correct Answer: C



The x-component of vector A can be used to calculate the magnitude of A:

The y-component can then be calculated:

which corresponds to (C).