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JEE Advance - Physics (1982 - No. 2)

A particle is moving eastwards with a velocity of 5 m/s. In 10s the velocity changes to 5 m/s northwards. The average acceleration in this time is
zero
$${1 \over {\sqrt 2 }}m/{s^2}$$ towards north-west
$${1 \over {\sqrt 2 }}m/{s^2}$$ towards north-east
$${1 \over 2}m/{s^2}$$ towards north

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