Use the following information for questions 4, 5 and 6. A ball on a rail is rolled down an incline, and then rolls across a table on a
horizontal rail. It leaves the rail, and strikes the floor. Assume
friction on the rail is negligible. A student finds that it takes 0.96
seconds to pass through a pair of photogates that are 22 cm
apart. The edge of the rail is 106 cm above the floor. (You will
need to convert centimeters into meters in order to proceed.
100 cm = 1 m)

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?