the answer is option B.because the object weight on earth is 250 N. we know that W=mg.......1) so put values, to find mass of body divide the totall weight of object on gravitational acceleration which is 9.8.so we get 25 kg mass. now put the value of mass and the gravitaional acceleration on pluto on equation 1 we get.
W=(25)(0.61)
W=156.6 newton..
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