A truck travelling due north at 20 m/s turns left and travels at same speed. Find the change in velocity. from Physics Motion in A Plane Class 11 Manipur Board
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A truck travelling due north at 20 m/s turns left and travels at same speed. Find the change in velocity.

Consider, unit vector along north is straight i with hat on top and that along west is straight j with hat on top. 

Thus,

Velocity of truck travelling due north,  stack straight v subscript 1 with rightwards arrow on top space equals space 20 space straight i with hat on top

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Now the change in velocity of truck is,

         increment straight v with rightwards arrow on top equals stack straight v subscript 2 with rightwards arrow on top minus stack straight v subscript 1 with rightwards arrow on top equals 20 straight j with hat on top minus 20 straight i with hat on top

               equals 20 square root of 2 space due space SW 

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