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bis/view.php?id-4444679 Jump to... 10/23/2017 11:55 PM 0/9 PrintCaloulator Periodic Table Question 1 of 9 Map Sapling Learning Pool players often pride themselves on their ability to impart a large speed to a pool ball. in the sport of bilards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in which the player strikes a ball with his pool cue). With the rail removed. a bail can fly off the table. As the only participant with a physics background, they have placed you in charge of determining the speed of the players break shots. 0.790 m 375 m The top of the pool table is 0.790 m from the floor. The placement of the tape is such that 0 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 record for the break shot of 32 mph (about 14.3 m/s). If the winner's ball landed a distance 3.75 m from the table edge, caiculate his break shot spood. mis At what speed did his pool bail hit the ground? OPeious Give Up & View Solution Chock AnswerNext -1 Est 4 5 6 7 8 9

Explanation / Answer

There is no acceleration in the horizontal direction.

So, x = uxt

=> t = 3.75/ux

and initial velocity is entirely in horizontal direction.

So, h = 0.79 = (1/2)9.8t2

=> t = 0.4015 s

substitute this above to get:

ux = 3.75/0.4015 = 9.34 m/s

this is the break shot speed.

at the ground, the vertical velocity will be:

vy = 0 + 9.8(0.4015) = 3.9347 m/s

so, the speed at the ground will be:

|v| = [(3.9347)2 + (9.34)2]1/2 = 10.135 m/s.

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