The load is lifted with a movable block by 10 m, applying a force equal to 400 N. What is the mass of the load?

If the block is mobile, then it gives a 2-fold gain in strength, which means the weight of the load is 800N, therefore, m = p / g = 800/10 = 80kg

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.