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Two blocks of masses m1 and m2 (m1 gt m...

Two blocks of masses `m_1` and `m_2 (m_1 gt m_2) ` in contact with each other on frictionless, horizontal surface. If a horizontal force F is given on` m_1` set into motion with acceleration a, then reaction force on mass `m_1` by `m_2` is

Text Solution

Verified by Experts

Here no external forces are acting on the system so :
`vecF_(exct).=0 rArr W_("ext")=0` `"According to work-energy theorem":`
`"Total W.D".="change in K.E".`
`"or" W_("ext")+W_("int")="Final K.E.-Initial K.E".`
`0+W_(int)=0-(1/2mu^(2)+1/2mu^(2)) `
`"or" W_(int)=-mu^(2)=-20J`
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