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Question

The velocity of a freely falling body changes as $$g^ph^q$$ where g is acceleration due to gravity and h is the height. The values of p and q are

A
$$\dfrac{1}{2},1$$
B
$$1,\dfrac{1}{2}$$
C
$$\dfrac{1}{2},\dfrac{1}{2}$$
D
$$1,1$$
Solution
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Correct option is B. $$\dfrac{1}{2},\dfrac{1}{2}$$
$$ v \propto g^ph^q$$ (given)

By substituting the dimension of each quantity and comparing the powers in both sides

we get $$[LT^{-1}]=[LT^{-2}]^p[L]^q$$

$$\Rightarrow p+q=1,-2p=-1$$

$$ \therefore p=\dfrac{1}{2},q=\dfrac{1}{2}$$

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