a ship move with a speed of 3m/s due east ;and then it turns through 90 degree due north and cover the same distance with a speed of 4m/s calculate its average speed and average velocity

Average speed = 3 + 4 / 2 = 3.5 m/s

Velocity is a vector quantity.

The vectors of velocity here forming right angle triangle with sides being 3 and 4 m/s. So, resultant velocity is 5 m/s and in north-east direction.

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