Aball is thrown into the air with 100 j of kinetic energy, which is transformed to gravitational potential energy at the top of its trajectory.

when it returns to its original level after encountering air resistance, its kinetic energy is

a) more than 100 j.

b) not enough information given.

c) less than 100 j.

d) 100 j.

To solve this problem we could apply the concepts given by the conservation of Energy.

During the launch given in terms of kinetic energy and reaching the maximum point of the object, the potential energy of the body is conserved. However, part of all this energy is lost due to the work done by the friction force due to friction with the air, therefore

The potential and kinetic energy are conserved and are the same PE = KE and this value is equivalent to 100J, therefore

The kinetic energy will ultimately be less than 100J, so the correct answer is C.

small = small current large mag large current

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force