Question

a bullet is moving with velocity of 100 strikes a wooden plank. it penetrates to the d depth of 20cm before coming to stop. calculate the average restardation of the bullet. while passing through it

Answer 1

using
V^2-u^2=2as
0^2-100^2=2a0. 2
-10000=0.4a
-250m/s^2=a
this gives retardation