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find out the change in momnetum

then average force of resistance= rate of change of momentum= (change in momentum)/ (time interval)

so 1st u have to calculate..how much time bullet will take in coming to rest?

does it make sense?

change in momentum= (final momentum- initial momentum)

1st find accl

i mean... 1st the bullet was moving with a speed of 150m/s then its momentum = m(150), m=20g

yes use the formula v^2- u^2= 2as

\[V^2 - u^2 = 2as\]
\[\frac{ 150*150*100 }{ 2*10 } = a\]

\[F= Ma\]

Note mass shuld be in kg 1 gm = 10^-3 kg

no need to calculate change in the momentum

hope this helps

am sry i din see that .. am sry !

No...Problem.....and welcomee...

:)