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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Two blocks of masses m = 2 kg and m= 8 kg are connected to a spring of force constant K = 1 k N/m. The spring is compressed by 20 cm and the two blocks are held in this position by a string. The system is placed on a horizontal smooth surface and given a velocity u=3 m/s perpendicular to the spring. The string snaps while moving. Find the speed of the block of mass m when the spring regains its natural length.

Two blocks of masses m = 2 kg and m= 8 kg are connected to a spring of force constant K = 1 k N/m. The spring is compressed by 20 cm and the two blocks are held in this position by a string. The system is placed on a horizontal smooth surface and given a velocity u=3 m/s perpendicular to the spring. The string snaps while moving. Find the speed of the block of mass m when the spring regains its natural length.

A railway flat car moves at a speed V. The gun barrel makes an angle α = 60∘ with the horizontal. A shell of mass m leaves the barrel at a speed v = 12 m/s relative to the barrel. Find the speed of the flat car V (in m/s) in order that it may stop after the firing. whose mass together with the artillery gun is M = 2 m