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`        A bullet on penetrating 2 successive wooden planks of unqual thickness loses its velocity by 200meter per second in each case. If the initial velocity is 1000meter per second calculate the ratio of thickness of the Planks.`
2 years ago

Eshan
2095 Points
```							Loss in kinetic energy of bulletthrough a blockthickness of the block.Hence for the first blockfor the second block,
```
one year ago
Ankan Pal
15 Points
```							Initial velocity-1000 m/SAfter penetrating 1st block final velocity -(1000-200)=800 m/SFor 2nd block initial velocity-800m/SFinal velocity-600 m/SNow,V1^2=u1^2-2as12as1=u^2-v^2.       _(1)as1=18000V2^2=u2^2-2as22as2=u2^2-v2^2as2=14000.          _(2)Now (1)÷(2)= as1÷as2=18000÷14000S1:s2= 9:7Hence the ratio of the thickness of the planks are 9:7
```
5 months ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions