The star Aldebaran has a radial velocity of 54 km / s. The direction of motion of the star in space forms an angle of 18.4 °

The star Aldebaran has a radial velocity of 54 km / s. The direction of motion of the star in space forms an angle of 18.4 ° with the line of sight. Find the tangential speed of the star.

decision
tg ф = v1 / v; v = v1r * tg f; v1t = 54 tg l8.4 ° = 17.96 = 18 (km / s).

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