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Let the question be written in the language of Modular Airthmatic.Let the X be a 4 digit number.X=5 (mod 341)In Parametric Form,X=5 +341 t where t is any integer.Take t =3X=1028Take t =5X=1710No. of NUMBERS of natural numbers =(5 -3)+1=3 □ ANSWER.

Q: A boy throws a stone vertically downwards down a well at 12m/s, if he hears the stone hit the water 3 secs later, how deep is the well?A: We have a kinematic equation for the downwards trip: s = u.t + 1/2 a. t^2 and we have a travel time delay on the upward trip s = 341 . (3 - t) supposing c = 341 m/s.We put these equations together as 12 .t + 1/2 x 9.81 t^2 = 341 (3 - t)and then simplify: 12t + 4.91 t^2 = 1023 - 341 t4.9 t^2 + 353 t -1023 = 0so t = 2.78997 secs and the sound transmission time = 3 - 2.78997 = 0.21 sec and depth of well is 341 x 0.21 = 71,62 meters.(I used this solver for the root of the quadratic)Wolfram|Alpha: Making the world’s knowledge computable

Yay, I get to feel like Einstein by answering a high school-level physics question! I had to look some of this up on Wikipedia real fast, but don’t tell anyone that. Sssshhhh….The equation for the time it takes an object to fall is given as:[math]t[/math][math] = \sqrt{\frac{2d}{g}}[/math]Where d is the distance fallen and g is the acceleration due to gravity. 1000 feet is approximately equal to 340.8 meters, so we’ll round to 341 meters. Acceleration due to gravity on the moon is 1.6m/s^2. The time it takes you to fall that far is equal to:[math]t[/math][math] = \sqrt{\frac{682m}{\frac{1.6m}{s^2}}}[/math]Which means that[math]t[/math][math] = \sqrt{\frac{682ms^2}{1.6m}}[/math](meters cancel, divide it out)[math]= \sqrt{426.25s^2} = ~21s[/math]So it takes you approximately 21 seconds to fall that distance.The equation for instantaneous velocity [math]v_i[/math] after falling for a certain period of time is given like this:[math]v_i = gt = \frac{1.6m}{s^2}20s = \frac{30ms}{s^2} = \frac{30m}{s}[/math]So you’re going 30m/s, which is about 108km/h or 67 miles an hour (roughly).So, um, imagine being hit by a car going 67mph. Sound painful? That’s what happens if you fall from that height on the moon. Splat!(you’re getting clocked with one of these)To give you another idea of how hard this hits, this is roughly equivalent (according to this thing because I’m too lazy to do any more calculations) to falling from about 153 feet on Earth. You can survive a fall from that height, but it’s pretty ill-advised to try it.(very roughly like jumping off the roof of this building)