Physics

Hello can someone please help me with this physics question and show the work so I can understand?

A box at the top of a rough incline possesses 981 joules more gravitational potential energy
than it does at the bottom. As the box slides to the bottom of the incline, 245 joules of heat is
produced. Determine the kinetic energy of the box at the bottom of the incline. Treating the
box as the system, what is the rate at which mechanical energy is lost from the system?

Thank you in advance!!

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  1. m g h = 981 Joules

    245 Joules is lost heating the pavement

    981 - 245 = 736 Joules is left at the bottom

    That 736 Joules is all Kinetic Energy now because m g h = m g * 0 = 0

    245 Joules was lost. I do not know the time so can not tell you the rate of energy loss (power)
    Perhaps you want percentage of energy lost
    100 * 245/981 = 25 % lost to heat

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