Two objects collide head on. The first object of mass 1.8x10 kg has initial speed +15 mls, and the second object of mass 9.0x102kg travels with speed -15 m/s. After collision they become entangled. Find the change in kinetic energy AEK: ....... 4.5 x102 J ....... 2.7x'l 05 J ....... 14J 6. Will the same ship float higher in salt water than in fresh water? ....... will float higher ....... will not change ....... will float lower 7. How much will a pendulum period change when its length will increase 4-times? ....... will increase 4-times ....... will increase 2-times ....... will decrease 2-times