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A truck travelling due north at 20 m/s t...

A truck travelling due north at 20 m/s turns east and travels at the same speed. What is the change in velocity :

A

`20sqrt(2)` m/s North-East

B

`20sqrt(2)` m/s South-East

C

`40sqrt(2)` m/s North-East

D

`20sqrt(2)` m/s North-West

Text Solution

Verified by Experts

The correct Answer is:
B
`bar(V_(1))=20hat(j)`
`bar(V_(2))=20hat(i)`
Change in velocity
`Deltabar(V)=bar(V_(2))-bar(V_(1))`
`bar(V)=+20hat(i)-20hat(j)`
`|bar(v)|=20sqrt(2)`
Direction south - east
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Knowledge Check

  • A train is moving north with speed 20 m s. If it turns west with same speed

    A
    The resultant velocity makes an angle of 45° in the south of west direction.
    B
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    D
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