The weight of an astronaut plus his space suit on the moon is only 255N. How much do they weigh on earth in newton’s assuming the acceleration due to gravity on the moon is 1.67 m/s2?What is the mass of the astronaut and his space suit on the moon in kilograms? What is the mass of the astronaut and his spacesuit on the earth in kilograms?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!