Question

a bullet movingwith 20m/s . strikea wooden black penetrates into at and comes to rest in 0.02 seconds. calculate distance travelled before it comes to rest. please answer this question

Answer 1

Here,
Initial velocity,u=20m/s
Final velocity,v=0(as bullet came to rest)
W/k,
V=u+at
0=20+a(0.02)
a=-1000m/s²(-ve as the bullet is retarding)
Also,
S=ut+1/2at²
S=20(0.02)+1/2(-1000)(0.02)²
S=0.5m