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What will the kinetic energy of a pile driver ram be if it starts from rest and undergoes a 10 kJ decrease in potential energy?

Answer :

Answer:

[tex]KE_f = 10 kJ[/tex]

Explanation:

As per mechanical energy conservation law we can say that sum of kinetic energy and potential energy will always remains constant

so here we can say

[tex]KE_i + PE_i = KE_f + PE_f[/tex]

here we have

[tex]KE_i = 0[/tex]

as initially it starts from rest

so now we have

[tex]KE_f = PE_i - PE_f[/tex]

now we know that its final potential energy is decreased by 10 kJ

so we have

[tex]PE_f = PE_i - 10 kJ[/tex]

[tex]PE_i - PE_f = 10 kJ[/tex]

so the final kinetic energy will be

[tex]KE_f = 10 kJ[/tex]

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