A particle is moving eastwards with a ve...

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

`(1)/(sqrt(2))ms^(-2)` towards north-east

`(1)/(2)ms^(-2)` towards north

zero

`(1)/(sqrt(2))ms^(-2)` towards north-west

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