a bullet moving with a velocityof 100m/s can just penetrate two planks of equal thickness. thenumber of such planks penetrated by the same bullet when the velocity is doubled will be 4 6 8 10

Question

Shubham Singh · Answer

8 velocity is doubled means kinetic energy is made 4 times

Bipin Mehta · Answer

3 rd 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. → s 1 ÷ s 2 = u 1 ^2 ÷ u 2 ^2 Therefore, s 2 = (u 2 ^2 ÷ u 1 ^2) x s 1 = (200÷100)^2 x 2 (planks) = 8 planks Answer is 8

Saroj Paudel · Answer

Let the velocity be V and thickness be h ( initial) H (final) Now V^2=2gh. h= thickness Againa (2v)^2=2gH 4v^2=2gH 4*2gh=2gH 4h=H H=8 . h=2plancks

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a bullet moving with a velocityof 100m/s can just penetrate two planks of equal thickness. thenumber of such planks penetrated by the same bullet when the velocity is doubled will be 4 6 8 10

a bullet moving with a velocityof 100m/s can just penetrate two planks of equal thickness. thenumber of such planks penetrated by the same bullet when the velocity is doubled will be

4

6

8

10

3 Answers

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