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If a unit vector represented by 0.5hati-...

If a unit vector represented by `0.5hati-0.8hatj+chatk`, then the value of 'c' is :

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The correct Answer is:
B
Planck's constant (in terms of unit)
`(h)=J-s=[ML^(2)T^(-2)][T]=[ML^(2)T^(-1)]`
Momentum (p)
`=kg-ms^(-1)=[M][L][T^(-1)]=[MLT^(-1)]`
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