2).A 5.18 g bullet moving at 672 m/s strikes a 715g wooden block at rest on a frictionless      surface. The bullet emerges with its speed reduced to 428m/s. Find the resulting speed      of the block.

Firecracker a. A firecracker is at rest on a frictionless horizontal table. The firecracker explodes into two pieces of unequal mass that move in opposite directions on the table. Before i. Is the net force on the left piece always zero? Explain. After I1. Is the net force on the system consisting of both pieces always zero? Explain. iii. Is the momentum of the left piece conserved? Explain. 1V. Is the momentum of the system consisting of both pieces conserved? Explain.

360 N marine in basic training climbs a 15 m vertical rope at uniform speed in 8 minutes. His output power

= 72.18 m/s at an angle of 0, = 23° with the horizontal. Neglecting air resistance, %3D A projectile is fired from the edge of a 148.6 m cliff with an initial velocity of vo .find the horizontal distance from the gun to the point where the projectile strikes the ground Uo hm