Question

a bullet is fired at a plank of wood with a speed of 200 m per second after passing through the plant it is producers to 180 metre per second is a bullet of mass M size and same mass but moving with the speed of hundred metre per second is fired at the same plant then the speed of bullet after passing through the plants ​

Answer 1

let the retardation is constant(a) then we can use

v2 = u2 + 2as

v2-u2 = 2as ( s is width of plank)

for first bullet , v = 180 , u = 200

1802 - 2202 = 2as ...............1

for second bullet , v=? , u = 100 so

v2 - 1002 = 2as ..............2 (width of plank & resistance remains same)

divide 1/2

1802 - 2002/v2-1002 = 1

v2 = 2400

v = 49m/s


Mark it as brainliest answer