physics
posted by Jessica .
Calculate the force of gravity on a spacecraft 19200 km (3 earth radii) above the Earth's surface if its mass is 1000 kg.
what equation would i use

they gave you 3 earth radii so you really do not have to do it out
1 earth radius out from center
W = m g = 1000(9.81) = 9810 N
3 radius above = 4 radii from center
F = 1/(4)^2 value at surface
=(1/16)(9810)
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