Question

Which of the following is null vector

Answer 1

Explanation:

Reason: Null vector is a vector with zero magnitude. Cross product of two paralle or antiparallel vectors is a null vector.

Answer 2

Given : Vector

To Find : Which is null vector

1 Net displacement of a particle moving once around a circle

2 Velocity of body projected vertically up when the body is at highest point

Both 1 & 2

None of the above

Solution:

Displacement = Final position - Initial position

a particle moving once around a circle

=> Final position =  Initial position

Hence Displacement = 0     and it has Direction also

so its a  null vector

Velocity of body projected vertically up when the body is at highest point

Vertically up hence Horizontal velocity = 0

Vertical velocity at highest point = 0

so Net velocity = 0

So This is also a null vector

Both 1 & 2 is correct option

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