A 0.087 kg bullet is fired and will soon collide with a 3.2 kg wooden block. The bullet has not collided with the block yet. At this time, the bullet and block system can be described as follows: Vbullet = 225 m/s
Vwood block = 0 m/s
What is the total momentum of the system at this time?

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)