The unit of ‘G’ in S.I is

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N m^{2} K g^{- 2}

N m^{5} K g^{- 2}

N m^{2} m^{3}

None of the Above

answer is A.

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Detailed Solution

The unit of ‘G’ in S.I is

N m^{2} K g^{- 2}

.
Unit of force is

wton (N)

. All forces have same units.
What i guess from the posting, you want to know the units of gravitational constant G
Units of gravitational constant,
⇒

G = N m^{2} k g^{- 2}

Units of gravitational constant can be checked from following formula
⇒

F = G \frac{m_{1} m_{2}}{d^{2}}

Where F is force , m's are masses of two objects and d is distance between objects.
⇒

G = F \frac{d^{2}}{m_{1} m_{2}}

Hence we can get units of G from above expression as

N m^{2} K g^{- 2}

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