16. According to the law of inertia, a book sliding on the table will eventually stop because:

a) Outside forces are acting on the book

b) It is the book's nature

c) It is the table's nature

d) None of the above

16. A semi-truck (mass = 100000 kg) collides with three cars of equal mass (mass = 2500 kg each). The semi-truck and the first car stick together and move at 40 km/hr. The other two move at =30 km/hr and = 18 km/hr respectively. Find the initial velocity of the semi-truck

Charcoal from an ancient campfire has a ratio of 14C to 12C that isone-sixteenth that of new wood. About how old is the charcoal? Thehalf-life of 14C is 5730 years.
_____ years old

Carbon obtained from a sample of frozen skin in a glacier is foundto have one-sixteenth the 14C-to-12C ratio of present-day carbon.About how old is the skin? The half-life of 14C is 5730years.
(________)years old