derive f=GMm/r^2derive f=GMm/r^2.derive f=GMm/r^2derive f=GMm/r^2derive f=GMm/r^2derive f=GMm/r^2derive f=GMm/r^2derive f=GMm/r^2derive f=GMm/r^2
derive f=GMm/r^2
derive f=GMm/r^2.
derive f=GMm/r^2
derive f=GMm/r^2
derive f=GMm/r^2
derive f=GMm/r^2
derive f=GMm/r^2
derive f=GMm/r^2
derive f=GMm/r^2