Question

two blocks a and b are connected by a springbof stiffness 200 N/m and placed on a smooth horizantal surface. initially the spring has its original length.the indicated velocity are imparted to a=1 m/s and b=2m/s .the max extension in the string will be

Answer 1

velocity= m1v1 + m2v2/m1+m2

=> a-2b/(a+b)

at max stretching the block will move with the above velocity bcoz the velocity of centre of mass remains constant if no external force is applied