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To find the weight of the object on the planet, we can use the formula:
Weight (W) = mass (m) * gravity (g)
Given that the mass of the object is 20 kg and the force of gravity on the planet is 4 m/s^2, we can substitute these values into the formula:
W = 20 kg * 4 m/s^2
W = 80 N
Therefore, the weight of the object on the planet is 80 N. The correct answer is a) 80 N.