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Question

A spring of spring constant k connects two blocks of masses m1 and m2 as shown in the figure. The block of mass m2 is given a sharp impulse so that it acquires a velocity Vo towards right. Find the maximum elongation of the spring.
1107102_daa05cd72426425ca16c0e74d187c923.png

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Solution

x => maximum elongation of spring

Change of Kinetic Energy = Potential stored in spring

12m2vo212(m+m)×mv2(m+m)=Kx2

m2v02[1m2(m+m)]=Kx2

x=m1m2(m1+m2)2×vo


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