Gravitation class 11 important questions

Q 1. If the radius of earth shrinks by 2 % , mass remaining constant , then how would the value of acceleration due to gravity change ?

Q 2. On a planet whose size is the same and mass 4 times as that of the earth , find the energy needed to lift a 2 kg mass upwards through 2 m distance in joule. The value of g on the surface of earth is 10 m/s square