Question

16) Which of the following is a vector?
( a) speed ( b) displacement c)mass d) time​

Answer 1

Displacement is Vector

Explanation:

Vector quantity has magnitude and direction both.

speed is linear , direction does not matter here

Speed = Distance / time

Distance is a scaler quantity

Displacement is vector as here direction matters

mass  is a scaler quantity

Time is not a vector.

Displacement is vector

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Answer 2

DISPLACEMENT is a vector quantity.

But why?

First of all, let's learn what is a vector !

• A vector is a physical quantity which has both magnitude as well as directions.

• This means that in order to describe a vector, we need to provide information about the magnitude as well as the direction in which the vector is operating.

So, in the given options:

• Speed is not a vector, because it is defined as the ratio of total distance by total time. Hence, it only requires magnitude for description and has no directions.

• Mass is a scalar, because it only has magnitude.

• Time is also a scalar.

But displacement is a vector ! why ?

• Displacement is defined as the shortest length between the starting and stopping point of an object.

• So, we always to describe displacement in terms of magnitude as well as direction.

• Hence, it's a vector.

• $\vec{d}=|d|\hat{d}$

$\star$ Hope It Helps.