0

Guest

Courses New

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?

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?

Grade:8

2 Answers

Arun
25750 Points
4 years ago
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 ÷ u2^2
Therefore, s2 = (u2^2 ÷ u1^2) x s1 = (200÷100)^2 x 2 (planks) = 8 planks
Answer is 8
Khimraj
3007 Points
4 years ago

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.

Think You Can Provide A Better Answer ?

Other Related Questions on Mechanics

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More