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`        If a bullet traveling at 100m/s can penetrate 2 wooden block of same thickness.if it’s speed is doubled ,then what number of wooden blocks it can penetrate?`
5 months ago

Arun
22962 Points
```							Dear student  3rd equation of motion can be be applied: v^2 = u^2 + 2as, where acceleration is -ve. Hence v^2 = u^2 – 2as.v, final velocity = 0. Therefore, u^2 = 2as.i.e. s is proportional to u^2. → s1÷ s2 = u1^2 ÷ u2^2Therefore, s2 = (u2^2 ÷ u1^2) x s1 = (200÷100)^2 x 2 (planks) = 8 planksAnswer is 8
```
5 months ago
Khimraj
3008 Points
```							When speed is doubled, the kinetic energy is quadruple.But…In practice bullets never stay in the same shape when penetrating hard materials, like wood. They deform which alters the path and increases friction…So theoretically I'd say 8 planks, practically I wouldn't know.
```
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