XX have a formula XX calculate XXXXX XX a body, XXXXXX XXXXXX, on XXXXXXX XXXXXX: , where U0 is a starting XXXXX, h, or y, is XXXXXX XX body, U – speed on that XXXXXX. XX know XXXX speed XX XXXXXX XX (XXX’s call it XX) XX 3 XXXXX XXXXXXX than XXXXX XX XX height XX. Let’s XXXX XXXXX Ub XX x, XXXX speed XX is 3x. XXX let’s substitute it in our formula:
Here XX XXX a system of equations. To XXXXX it, XXX’s XXXXX both equations XX the XXXXX XX 2:. Now XX XXXXXXXX XXXXXX equation from first. XX get . XXXXXX by -1 XXX take out XX XXXX XXXXXXXX: . XXX XX XXXX what is! XX is distance d! So after few XXXXXXXXXXXXXXX: . XXX’s XXXXXX what x is – it is speed XX, and XXXXX XX XX 3x. So XX get Ua we multiply x XX 3: . Now XXXX put the XXXXXXX: . (g XX XXXXXXX XXXXXXXXXXXX, XX recall). After XXXXXXXXXXXX, XX XXX X.038, XXXXXXXXXXXXX X. So XXX answer is 1 XXXXX XXX XXXXXX. (Because d XXX in meters and g is m2/s ). Good XXXX!