Hi, Please can I have some help with this problem: A machine gun in automatic mode fires 20g bullets with vbullet=300m/s at 60 bullets/second. a- If the bullets enters a thick wooden wall, what is the average force exerted against the wall? b- If the bullets hit a steel wall and rebound elastically,what is the average force on the wall? What i did is for a: I computed the impulse: I= pf-pi= m*v-( 0)=6 N.s to calculate the average force: I/(time for one bullet to be fired)= 6/(1/60)=360N Am I right? However I have no idea for the second question?? B.