A conservative system consists of a frictionless crane lifting a load of bricks at a construction site. The amount of work done by the crane against gravity is (1 point)
O equal to the kineäc energy of the system
• greater than the energy stored in the bricks
O less than the energy stored in the system
O is equal to the energy stored in the bnicks
The correct answer is: less than the energy stored in the system.
In a conservative system, the total mechanical energy (potential energy + kinetic energy) is conserved. When the crane lifts the load of bricks, it does work against gravity, increasing the potential energy of the system. However, this work is less than the total energy stored in the system (including the kinetic energy of the bricks). Energy is conserved, but not all of the energy stored in the system is converted into work done against gravity.