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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 5 - Work, Energy and Power > Two blocks M1 and M2 having equal mass are free to move on a horizontal frictionless surface. M2 is attached to a massless spring as shown in figure. Initially M2 is at rest and M1 is moving toward M2 with speed v and collides head-on with M2.

Two blocks M1 and M2 having equal mass are free to move on a horizontal frictionless surface. M2 is attached to a massless spring as shown in figure. Initially M2 is at rest and M1 is moving toward M2 with speed v and collides head-on with M2.

A man of mass m standing at the bottom of the staircase of height L climbs it and stands at its top .