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Two identical 5kg blocks are moving with...

Two identical `5kg` blocks are moving with same speed of `2ms^-1` towards each other along a frictionless horizontal surface. The two blocks collide, stick together, and come to rest. Consider the two blocks as a system. The works done by external and internal forces are, respectively,

Text Solution

Verified by Experts

Here no external forces are acting on the system so:
`vecF_("ext")=0impliesW_("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-(1/2"mu"^(2)+1/2"mu"^(2))`
or `W_("int")=-"mu"^(2)=-20J`
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