2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-10

  • question_answer
    A bullet of mass \[20g\] travelling horizontaly with a speed of \[500m/s\] passes through a wooden block of mass 80kg initially at rest on a level surface. The bullet emerges with a speed of \[100m/s\] and the block slides 20cm on the surface before coming to rest. The coefficient of friction between the block and the surface is \[(g=10m{{s}^{-2}})\]

    A)  \[0.4\]                                 

    B)  \[0.25\]

    C)  \[0.2\]                                 

    D)  \[0.1\]

    Correct Answer: B

    Solution :

    Given,  \[m=20g,\,\,m=8kg,u=500m{{s}^{-1}}\] \[\upsilon =100m{{s}^{-1}}\] By the law of conservation of momentum, \[m\mu =m\upsilon +m\upsilon \Rightarrow \,\upsilon =1m{{s}^{-1}}\] As,          \[f=\mu \,\,mg=ma\]                 \[a=\mu g=\frac{{{\upsilon }_{2}}}{2s}\]                 \[\mu =0.25\]


You need to login to perform this action.
You will be redirected in 3 sec spinner