Q11 / 126 · NTA Abhyas (NEET) 2020 · Physics · Motion In Two Dimensions

If a vector  A is given as A=4i^+3j^+12k^, then the angle subtended with the x-axis is

  • A
    sin-1⁡413
  • B
    sin-1⁡313
  • C
    cos-1⁡313
  • Correct answer
    D
    cos-1⁡413

Solution

Let α is the angle which A makes with x - axis, then

cos⁡α=AxA=442+32+122=413

α=cos-1⁡413

Hence, the correct answer is option: 'D'.

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