Your conducting a physics experiment on another planet you drop a rock from a height of 2.3 m and it hits the ground 1.1 seconds later what is the acceleration due to gravity on this planet

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n