Question

A bullet moving at a velocity 100 m/s can penetrate two planks of equal thickness.The number of planks penetrated by the bullet of it's velocity is doubled?​

Answer 1

Answer:

4

Explanation:

at 100m/s it penetrate 2 planks

If it is doubled hence the velocity =200m/s

Now lets compare velocity needed to penetrate one plank

For 2 planks =100

hence,For 1 plank it =100/2=50

hence For v=200, velocity to destory 1 plank =50

thus 200/50=no planks destroyed

thusno plank s =4