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If 0.8 hati + 0.2chatj represents direc...

If `0.8 hati + 0.2chatj` represents direction, then the value of c will be:

Text Solution

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The correct Answer is:
3
`sqrt((0.8)^(2) + (0.2c)^(2))=1`
`0.64 + 0.04c^(2) = 1`
`0.04c^(2) = 0.36`
`c^(2)= 9`
` therefore" " c= 3`
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