First slide
Collisions
Question

A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be

Moderate
Solution

By conservation of momentum,  mv+M×0=(m+M)V
Velocity of composite block V=mm+Mv
K.E. of composite block  =12(M+m)V2
=12(M+m)mM+m2v2=12mv2mm+M

Get Instant Solutions
When in doubt download our app. Now available Google Play Store- Doubts App
Download Now
Doubts App