   A heavier plane has more momentum (when thrown at the same speed),  but it's also got more downward force acting on it. If it has the  same wing area, though, it has the same lift, so it drops more  quickly than a light plane (objects fall at the same speed only in  the absence of air resistance).
By 2 months, baby's bedtime should be between 6:00-8:00pm and should occur about 1 hour after the last nap ends. 3 months: babies this age should be on a solid 4 nap schedule with the last nap of the day ending by 5:00pm.
Most children from about 21 to 36 months of age still need one nap a day, which may range from one to three and a half hours long. They typically go to bed between 7 and 9 p.m. and wake up between 6 and 8 a.m. 3-6 Years Old: 10 - 12 hours per day.here is still a wide range of bedtimes, from 7:30 to 10 p.m., as well as total sleep times, from 9 to 12 hours, although the average is only about 9 hours. 12-18 Years Old: 8 - 9 hours per day.