15. In two block system 4kg block rests on a smooth horizontal surface , upper surface of 4kg is rough. A block of mass 2kg is placed on its upper surface .The acceleration of upper block w.r.t earth when 4 kg mass is pulled by a force 30 N is 1. 6m/s2 2. 5m/s2 3. 8 m/s2 4. 2 m/s2

15. In two block system 4kg block rests on a smooth horizontal surface

1.	15. In two block system 4kg block rests on a smooth horizontal surface , upper surface of 4kg is rough. A block of mass 2kg is placed on its upper surface .The acceleration of upper block w.r.t earth when 4 kg mass is pulled by a force 30 N is 1. 6m/s2 2. 5m/s2 3. 8 m/s2 4. 2 m/s2
Answer» 15. In two block system 4kg block rests on a smooth horizontal surface , upper surface of 4kg is rough. A block of mass 2kg is placed on its upper surface .The acceleration of upper block w.r.t earth when 4 kg mass is pulled by a force 30 N is 1. 6m/s2 2. 5m/s2 3. 8 m/s2 4. 2 m/s2

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15. In two block system 4kg block rests on a smooth horizontal surface , upper surface of 4kg is rough. A block of mass 2kg is placed on its upper surface .The acceleration of upper block w.r.t earth when 4 kg mass is pulled by a force 30 N is 1. 6m/s2 2. 5m/s2 3. 8 m/s2 4. 2 m/s2

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