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fig 4E.12 shows a, Man + Rocket Launher ...

fig 4E.12 shows a, Man + Rocket Launher of total mass = m= 90 kg u= 5 m/s mass of rocket =m= 10 kg
Muzzle velcoity of Rocket =`v_(0) = 30m//s`
(a) what will be man's and rocket 's velocity's after firing .
(b) find energy of explosion .

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