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Question

Classify the below given measures as scalars and vectors:

(i) 10 kg

(ii) 2 m north-west

(iii) 40

(iv) 40 W

(v) 1019 C

(vi) 20 m/s2

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Solution

(i) Scalar. Here the unit involved is 'kg' which is the unit of mass and direction is not there .We know that mass is scalar so, 10 kg will also be a scalar.

(ii) Vector. 2 m north-west is a vector quantity as it involves both magnitude (2 m) as well as direction (north-west).

(iii) Scalar. 40 represents an angle and we know that angle is a scalar quantity as it involves only magnitude.

(iv) Scalar. Here the unit involved is watt which is the unit of power which is a scalar quantity. So, 40 W is a scalar quantity as it involves only magnitude.

(v) Scalar. 1019 C is a scalar quantity as it involves only magnitude.

(vi) Vector. Here the unit involved is 20 m/s2 which is the unit of acceleration and acceleration is a vector quantity. So, 20 m/s2 is a vector quantity as it involves magnitude as well as direction.


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