I am also confused about this problem...I think it is KEf-KEo,but I don\'t know

Question

I am also confused about this problem...I think it is KEf-KEo,but I don't know how to do it....can you help please?
I drop a 0.2kg ball from a height of 2m onto thefloor. It bounces back to a height of 1.6m. How muchenergy did it lose in the collision with the floor and to airresistance? I am also confused about this problem...I think it is KEf-KEo,but I don't know how to do it....can you help please?
I drop a 0.2kg ball from a height of 2m onto thefloor. It bounces back to a height of 1.6m. How muchenergy did it lose in the collision with the floor and to airresistance?

Explanation / Answer

         Given thatthe mass of the body is m = 0.2 kg          Initialheight is h1 = 2 m          final heightis h2 = 1.6m ---------------------------------------------------------       Initial energy is E1 =mg*h1                                    = 0.2kg*9.8m/s2*2m                                     =3.92 J                     Final energy is E2 = mg*h2                                    = 0.2kg*9.8m/s2*1.6m                                     = 3.136J               The loss in energy is E =E1 - E2                                           = --------------- J                                                      = 0.2kg*9.8m/s2*1.6m                                     = 3.136J               The loss in energy is E =E1 - E2                                           = --------------- J                  

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