Question

9: A body is moving in north direction with a velocity of 22 m/s, turns west
and continues with the same velocity. What is the change in its velocity?
O There is no change in velocity.
O The magnitude of change is zero.
O There is a non zero change in velocity.
O Option 4​

Answer 1

Answer:

c. There is a non zero change in velocity.

Explanation:

Let us assume that i and j are unit vector along north and west direction respectively.

Now, initial velocity ⃗v₁ = 22i m/s

Final velocity ⃗v⃗₂ = 22j m/s

Change in velocity vector is given by

Δ⃗v = ⃗v₂ - ⃗v₁

= 22j - 22i

= -22i + 22j m/s

Hence change in velocity is non zero.

Also magnitude of change in velocity is given by

|Δ⃗v| = √(22² + 22²)

= 22√2 m/s