A shot travelling at the rate of `100m//s` is just able to pierce a plant 4 cm thick. What velocity is required to just pierce a plank 9cm thick ?

A shot travelling at the rate of 100ms^(-1) is just able to pierce a plank 4cm thick. What velocity is required to jut pierce a plank 9cm thick?

A shot travelling at the rate of 100 ms^(-1) is just able to pierce a plank 4 cm thick. What velocity is required to just pierce a plank 9 cm thick ?

A shot travelling at the rate of 100 ms^-1 is just able to pierce a plank 4 cm thick. What velcoity is required to just pierce a plank 9 mm thick?

A bullet of mass 20 g moving with a speed of 500 cm*s^(-1) is just able to pierce a plank 5 cm thick. Calculate its velocity ,when the same bullet penetrates through the same plank 1 cm thick.

How many pieces of plywood, each 0.45 cm thick, are required to make a pile 2.43 m high?

A bullet, moving with a velocity of 200 "m.s"^(-1) can just go through a 4 cm thick plank. What should be the velocity of a bullet for just going through a 10 cm thick identical plank?

A bullet moving with a speed of 120 m/s is able to penetrate through 5 cm into a thick wooden board. Calculate the required velocity of bullet to penetrate through 8 cm in the same wooden board .

A bullet of mass 100gm moving with a velocity of 100ms^(-1) just pierces through a plank of 100cm thick.If it is 50cm thick it emerges with a velocity

A bullet travelling horizontally looses 1//20^(th) of its velocity while piercing a wooden plank. Then the number of such planks required to stop the bullet is