# physics

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A 5.9-kg rock and a 3.0 10-4-kg pebble are held near the surface of the earth.
(a) Determine the magnitude of the gravitational force exerted on each by the earth.(b) Calculate the magnitude of the acceleration of each object when released.

• physics -

(a) F =G•m •M/R²
the gravitational constant G =6.67•10^-11 N•m²/kg²,
Earth’s mass is M = 5.97•10^24 kg,
Earth’s radius is R = 6.378•10^6 m.

(b) g= G•M/R²

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