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Answer :
Answer:
Explanation:
Given
Mass of girl [tex]m=45 kg[/tex]
Mass of Plank [tex]M=159 kg[/tex]
let [tex]v_p[/tex] and [tex]v_g[/tex] be the velocity of Plank and girl w.r.t ice
therefore [tex]v_{gp}=1.38 m/s[/tex]
Conserving Momentum
[tex](M+m)v_p+mv_{gp}=0[/tex]
[tex](45+159)v_p=-45\cdot v_{gp}[/tex]
[tex]v_p=-\frac{45}{204}\cdot 1.38[/tex]
[tex]v_p=-0.304 m/s[/tex]
[tex]v_{gp}=v_g-v_p=1.38[/tex]
[tex]v_g=-0.304+1.38=1.075 m/s[/tex]
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