Question

Q. Two blocks of masses 4 kg and 10 kg are connected with a massless string and a massless spring in between them. String goes over a massless and frictionless pulley as shown in figure. Initially the spring is unstretched. When 4 kg block is released from rest, minimum normal contact force between 10 kg block and the surface in contact with it will be (Take g = 10m/s?)

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Answer 1

energy conservation... when the 4kg block comes to rest

mgx=kx²/2

kx=2mg

m=4

kx=80N

normal=100-80=20