Differential
Equations Math 285 Hour
Exam 1 Fall, 2011
5. |
A bullet enters a 10 cm (0.2 m) wide board at the speed of 250 m/sec and leaves the board with the speed of 50 m/sec. How long does it take the bullet to go through if the resistance is proportional to the speed of the bullet? (Your answer may include roots, exponents, logs, etc.)
Answer: t = ln 5 / 2000 |