A bullet moving with a speed of 100m/s can just penterates two p

1.	A bullet moving with a speed of 100m/s can just penterates two planks of equal thickness . Then the number of such planks penterated by the same bullet when the speed is doubled will be
Answer» Use, v² = u² + 2as Here, the bullet is deaccelerating as its final velocity is 0 so acceleration will be negative. v² = u² - 2as 0 = u² - 2as u² = 2as We can say that u² is directly proportional to S. Where S is length of block, we cosidered here 2 blocks with length as 2 units. the number of units obtained will give us number of blocks (u₁/u₂)² = (S₁/S₂) (100/200)² = (2/S₂) S₂ = 8 So there will be penetration upto 8 blocks.

A bullet moving with a speed of 100m/s can just penterates two planks of equal thickness . Then the number of such planks penterated by the same bullet when the speed is doubled will be

Answer»

Use, v² = u² + 2as
Here, the bullet is deaccelerating as its final velocity is 0 so acceleration will be negative.

v² = u² - 2as
0 = u² - 2as
u² = 2as

We can say that u² is directly proportional to S. Where S is length of block, we cosidered here 2 blocks with length as 2 units. the number of units obtained will give us number of blocks
(u₁/u₂)² = (S₁/S₂)
(100/200)² = (2/S₂)
S₂ = 8

So there will be penetration upto 8 blocks.

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A bullet moving with a speed of 100m/s can just penterates two planks of equal thickness . Then the number of such planks penterated by the same bullet when the speed is doubled will be

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