[Tin tức] A particle is moving eastward with a speed of 5  m / s. In 10  s the velocity changes to 5  m / s…

A particle is moving eastward with a speed of 5  m / s. In 10  s the velocity changes to 5  m / s northwards. The average acceleration in this time is
(1) zero.
(2) 1/√(2) m / s^2 towards north-west.
(3) d / 2  m / s^2 towards north-west.
(4) 1 / 2  m / s^2 towards north.

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