If u varies directly with v, with k = 0.6, what is the value of u when v = 7.8?

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A

u = 13

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B. u=0.77

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C. u=0.468

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D. u = 4.68

D) The value of u is 4.68 when v = 7.8.

Step-by-step explanation:

Two quantities P and Q are said to be in proportion if one quantity is always a multiple of the other quantity.

or, P ∝ Q ⇒ P = k Q for some arbitrary constant k.

Here, u varies directly with v

⇒ u = k v

Now, k = 0.6 and v = 7.8

So, u = k v

= (0.6) x (7.8) = 4.68

or, u = 4.68

Hence, the value of u when v = 7.8 is 4.68.