Question

Example 6 : A person is moving due east with a speed
of 20 m/s. He turns northwards after 5 seconds without
changing his speed. Find the direction and magnitude
AV
of average acceleration. [given av
Δt​

Answer 1

Answer:

The initial velocity of the particle, v=20i^

After some time velocity changes to 20j^​

Change in velocity dv= 20j^​−20i^

Time taken t= 5 sec.

Average acceleration =∣tdv​∣=∣21​(j^​−i^)∣=2

​1​m/s2

The direction is north-west making 135 degrees with east as evident from its components.

Explanation:

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