A 1.0 kg rock is released from rest at a height of 37.0m.Ignore air resistance a

Question

A 1.0 kg rock is released from rest at a height of 37.0m.Ignore air resistance and determine the kinetic energy,gravitational potential energy and total mechanical energy at eachof the following heights: 37,18.5 and 0m. I have found the potential energies to be 362.6, 181.3, 0corresponding to 37 18.5 0 m. Please help me find kinetic energyvalues. A 1.0 kg rock is released from rest at a height of 37.0m.Ignore air resistance and determine the kinetic energy,gravitational potential energy and total mechanical energy at eachof the following heights: 37,18.5 and 0m. I have found the potential energies to be 362.6, 181.3, 0corresponding to 37 18.5 0 m. Please help me find kinetic energyvalues.

Explanation / Answer

   Potential energy    U   =   m * g* h    Your values for potential energy arecorrect.    Now use law of conservation of energy ( thatis the easiest way),    K.E. +P.E.   =   Constant   =   totalP.E. at heighest point    ath      =   37.0   m, initial velocity iszero,    K37   =   0    At height 18.5   m, p.e. isreduced to 181.3   J        K18.5   +   P18.5   =   362.6    K18.5   =   362.6   -   181.3   =   181.3   J    Finally   K0   +   P0   =   362.6    K0   =   362.6   -   0   =   362.6   J

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