1.    What is the type of energy of the stone that in your hand at the top of a building? 2.   A person wants to close the heavy door. At which point he should apply force to close if easier? Explain why.  (the following is shown in the picture)3.    What is the energy of a 50 kg boy standing on the 1100 cm high hill? Take g=10 N/kg 4.    An air compressor applies a pressure of 80 kPa  over the hydraulic fluid tank as  shown in the figure. The large piston that lifts the car has a cross-sectional area of 4 m2. What is the maximum weight that it can lift? 5.    An actual weight of an object is 50 N and apparent weight in water is 30 N. Density of water is 1000 kg/m3. What is the volume of an object? ​Пжжжж посчитайте люди.