They most likely plotted the range and angle from the telemetry, and used ballistic curve fitting to arrive at the most likely impact point.
2.
A Redstone rocket was used to boost the capsule for 2 minutes and 30 seconds to an altitude of and let it continue on a ballistic curve after booster-spacecraft separation.
3.
Then, you can consider the muzzle velocity, movement of the monkey, and ballistic curve ( as well as wind resistance ) .-- & trade; 17 : 52, 3 January 2008 ( UTC)