raph in lpful to nutes at (b) how much time did it take him to pitch it? usure p
ID: 3308375 • Letter: R
Question
raph in lpful to nutes at (b) how much time did it take him to pitch it? usure pitched bas IaRd at a speed of 45.0 m/s. If the pitcher wa contact with the ball over a distance of 1.50 m and produced c stant acceleration, (a) what acceleration did he give the ball, a 2.22 A Tennis Serve. In the fastest measured tennis sere st along the ball left the racquet at 73.14 m/s. A served tennis ball is typi- motion, cally in contact with the racquet for 30.0 ms and starts from rest. iven by Assume constant acceleration. (a) What was the ball's acceleration during this serve? (b) How far did the ball travel during the serve? 2.23 ar when BIO Automobile Air Bags. The human body can sur- h we will vive an acceleration trauma incident (sudden stop) if the magni- he equa tude of the acceleration is less than 250 m/s If you are in an s x (t) = automobile accident with an initial speed of 105 kmh (65 mih) he turtle's and are stopped by an airbag that inflates from the dashboard. n. (b) At long after over what distance must the airbag stop you for you to survive the crash?Explanation / Answer
2.22 : v0 = 0
vf = 73.14 m/s
t = 30 ms = 0.030 s
(A) vf = vi + a t
73.14 = 0 + 0.03 a
a =2438 m/s^2 .....Ans
(B) vf^2 - vi^2 = 2 a d
d = 1.10 m
2.23 : a = - 250 m/s^2
vi = 105 km/h = 105 x 1000 m / 3600 s
vi = 29.3 m/s
vf = 0
vf^2 - vi^2 = 2 ad
0^2 - 29.3^2 = 2(-250) d
d = 1.72 m
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