m*g = 40 N.
4.20g = 40
g = 9.52 m/s^2
a = F/m = 45.5/4.20 = 10.83 m/s^2.
On a planet far, far away, an astronaut picks up a rock. The rock has a mass of 4.20 kg, and on this particular planet its weight is 40.0 N. If the astronaut exerts an upward force of 45.5 N on the rock, what is its acceleration?
Magnitude
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