A particle is moving eastwards with a velocity of 5 m / s in 10 seconds the velocity changes to 5 m / s northwards. The average acceleration in this time is

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a = t V f ​ − V i ​ ​ = 10 5 j ^ ​ − 5 i ^ ​ = 2 1 ​ ( j ^ ​ − i ^ ) ∴ a = 2 ​ 1 ​ ms − 2 towards north west

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