ming Mapdeb Pool players often pride on their ability to impart a large speed to

Question

ming Mapdeb Pool players often pride on their ability to impart a large speed to a pool ball. In the sport of billiards, event organizers often remove one of the rails a pool to allow players to measure the speed of their break shots (the on table a ball with his pool With the rail a ball can opening shot of game in which the player strikes they have placed fly off the table. As only a you in charge of determining the speed of the players' break shots. 0.750 m 4.15 m The top of the pool table is 0.750 m from the floor. The placement of the tape is such that o m is aligned with the edge of the table (as shown). The winner of the competition wants to know if he has broken the world table for the break of 32 14.3 m/s) lf the winners ball landed a distance 4.15 m from the his break shot speed. Number m/s what speed did his pool ball hit the ground? Number m/s o Previous Give up 8 view Solution checks Answer 0 Next l Exit Hint

Explanation / Answer

in vertical ,
using h = ut + at^2 /2
0.750 = 0 + 9.8t^2 /2
t = 0.39 sec

in horizontal :
d = ut
4.15 = u*0.39
u = 10.61 m/s

using energy conservation ,
m10.61^2 /2   + mg (0.75) = mv^2 /2
v = 11.28 m/s

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