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  1. Two objects of masses 80kg and 50kg are separated by a distance of 0.2m. If the gravitational constant is 6.6 × 10<sup>-11</sup>Nm<sup>2</sup>kg, calculate the gravitational attraction between them.
  2. Calculate the escape velocity of a satellite launched from the Earth’s surface (Take g as 10ms<sup>-2</sup> and the radius of the earth as 6.4 × 10<sup>6</sup>m)
  3. What is the gravitational potential due to molecule of mass m at a distance r from it?
  4. The acceleration due to gravity may be defined as the force
  5. A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them. (G = 6.70 × 10<sup>-11</sup>Nm<sup>2</sup>kg)
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