A particle is moving eastwards with a velocity of 5m/. In 10s the velocity changes to 5m/ northwards.The average acceleration in this time is
(a) zero
(b) 1/√2ms-2towards north-west
(c) 1/√2ms-2towards north-east
(d) 1/√2ms-2towards north.
(b) : Velocity in eastward direction = 5cap i velocity in northward direction = 5cap j
