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U knw tht change in P.E. = change in K.E.
So, using the formulas from b i) n ii)
GMm/ 6R = (2.09 * 10^6)m
the m cancel each other out
So, substituting the values,
[(6.67 *10^11) * M]/(6 *3.40 * 10^6) = 2.09 * 10^6
So, M = 6.39 * 10^23 kg