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Q. A projectile is fired straight upward at 141 m/s. How fast is it moving at the the top of its trajectory? Suppose it is launched upward at 45 degrees about the horizontal plane. How fast is it moving at the tope of its curved trajectory?

Q. One recent study has shown that x rays with a wavelength of 0.0050 can produce significant numbers of mutations in human cells.Calculate the energy in of a photon of radiation with this wavelength.

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