numerical-problem-7-work-and-energy-physics-11 June 1, 2020 An object of mass 1000 g falls from a height of 30 m on the sand below. If it penetrates 4 cm in the sand what opposing force is exerted on it by sand? 1 Comment Problem 7: An object of mass 1000 g falls from a height of 30 m on the sand below. If it penetrates 4 cm into…