A machine which is `75%` efficient uses 12 J of energy in lifting up a 2 kg mass through a cerfain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in m/s)

A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in ms^(-1) )

A machine, which is 72 percent efficient, uses 36 joules of energy in lifting up 1kg mass through a certain distance. The mass is the allowed to fall through that distance. The velocity at the end of its fall is

A lifting machine, having an efficiency of 80 % uses 2500 J of energy in lifting a 10 kg load over a certain height. If the load is now allowed to fall through that height freely, its velocity at the end of the fall will be (g =10 m//s^(2))

An athelete in a gymansium room lifts a 50 kg mass through a vertical distance of 2.0 m , g=9.8 ms^(-2) . The mass is allowed to fall through 2.0 m distance while coupled to an electrical generator. The electrical generator produces an equal amount of electrical work. this electrical work is used to produce aluminium by hall's process involving the change, Al_(2)O_(3)("molten")+3C_((s))to2Al_((l))+3CO_((g)) The reaction require standard free energy change equal to 593 k J . how many times must the athelete lift 50 kg mass and to drop and couple with generator to produce sufficient Gibbs free energy to produce 27 g Al?

A freely falling body has a velocity V after falling through H.The distance it has to fall further,for its velocity to be tripled is