10. A firecracker travels straight up at 75.0m/s and explodes into two pieces. The smaller piece carries one third of the firecracker's mass and shoots off horizontally at 48.0m/s west. Determine the speed and direction of the other piece directly after the explosion. 11. Three blocks slide on a smooth surface, as shown in Figure A2.11. Initially, the first block (m1=1.0kg) moves at 3.0m/s to the right, the second block (m2=2.0kg) is at rest, and the third block (m3=3.0kg) moves to the left at 0.50m/s. First, m1 collides elastically with m2 and recoils to the left. Afterwards, m2 and m3 collide and stick. Calculate, - the velocities of m1 and m2 after the first collision. . the velocity of m2 and m3 after the second collision. Flgure A2.11 12. A billiard ball moves at a speed of 4.00m/s and collides elastically with an identical stationary ball. As a result, the stationary ball flies away at a speed of 1.69m/s, as shown in Figure A212. Determine . the final speed and direction of the incoming ball after the collision. . the direction of the stationary ball after the collision. 4.00 m/s 2 "i \\1.69 m/s Figure A2.12