Question

a bullet hits a wooden block with the speed of 30m/s.What time does it takes to penetrate through 20cm in the block​

Answer 1

Explanation:

Given,

u=300m/s

v=200m/s

s=20cm=0.20m

m=10g=0.01kg

3rd equation of motion,

2as=v2−u2

retardation, a=−125000m/s2

The resistance force, F=ma

F=0.01×125000

F=1250N