Question

"If a bullet of mass 20g is moving with a speed of 150 m s-1 strikes a target and is brought to
rest after piercing 10 cm into it, then calculate the average force of resistance offered by the
target."

Answer 1

given:
mass=m=20g=20/1000=0.02kg 
Initial velcoity=u=150m/s
Final velocity=0m/s
s=10cm=0.1m
According to Work _ Kinetic Energy Theorm
k-K1=W-Fs
1/2mu²-0=Fs
F=mu²/2s
=0.02x(150)²/2x0.1
=2250N

∴The average force of resistance offered by the target is 2250N

Answer 2

Answer:

and this is the answer...