On a small planet, an astronaut uses a vertical
force of 175 newtons to lift an 87.5-kilogram
boulder at constant velocity to a height of
0.350 meter above the planet's surface. What is
the magnitude of the gravitational field strength
on the surface of the planet?
(1) 0.500 N/kg (3) 9.81 N/kg
(2) 2.00 N/kg (4) 61.3 N/kg
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