help with part c and d of this bio assignment

help with part c and d of this bio assignment

One of the most worrisome waste products of a nuclear reactor is plutonium 239 (^239Pu). This nucleus is radioactive and decays by splitting into a helium-4 nucleus and a uranium-235 nucleus (^4He + ^235U), the latter of which is also radioactive and will itself decay some time later. The energy emitted in the plutonium decay is 8.40 ? 10^-13J and is entirely converted to kinetic energy of the helium and uranium nuclei. The mass of the helium nucleus is 6.68 ? 10^-27kg, while that of the uranium is 3.92 ? 10^-25kg (note that the ratio of the masses is 4 to 235).

(a) Calculate the speeds of the two nuclei, assuming the plutonium nucleus is originally at rest. ____ m/s (He) ____ m/s (U)

(b) About how much kinetic energy does each nucleus carry away? ____ J (He) ____ J (U)

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