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Represent graphically the variation of kinetic energy (E_k), potential energy (E_k) and total energy (E ) of a body falling freely from a height h. At what height is E_p = E_k ?

Einstein's photoelectric equation is E_k = hv - phi . In this equation E_k refers to

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The depth x to which a bullet penetrates a human body depends on (i) coeffeicint of elasticity, eta and (ii) KE (E_k) of the bullet, By the method of dimensions, show that x prop ((E_k)/(eta))^(1//3)