A suitable unit for gravitational constant is (a) kg - m sec^-1 (b) Nm^-1 sec (c) Nm^2 kg^-2 (d) kg m sec^-1

Gravitational force F is given by

F = Gm1m2/R2

Unit of F = N

Unit of mass = kg

Unit of R = m

Unit of G = Nm2kg-2

Hence, the correct option is (c)

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