Requires a golf ball, a stop watch and a friend to help you Throw a small ball (

Question

Requires a golf ball, a stop watch and a friend to help you Throw a small ball (best a golf ball) straight upward as hard as you can. Your friend can measure the time of flight of the ball using a stop watch Find the initial speed of your throw and the approximate maximum height of the ball solely with the use of the measured time 1) Please write here the equations you are using: Time of flight, T 2g Trial 1 2.47s Trial 2 2.26s Trial 3 3.16s Trial 4 3.15s Trail 5 2.45s m/s 2 m/s 2 m/2m/s2 m/sA2 2) What happens when you throw the ball at some angle other than 90-? Does this change the time of flight? Explain. When throwing the ball at an angle other than 90 degrees it is known as projectile motion and it does not change the time of flight. Can you still determine the maximum height and the initial speed? Explain.

Explanation / Answer

Trial 1

Time of flight=t=2.47 seconds

Let initial velocity be v

v=g*t/2 =9.8*2.47/2=12.1 m/s

Maximum height reached=v²/2g =12.1²/(2*9.8)=7.47 m

Trial 2

Time of flight=2.26 seconds

v=9.8*2.26/2=11.07 m/s

Maximum height=11.07²/(2*9.8) =6.25 m

Trial 3

Time of flight=3.16

Initial velocity=9.8*3.16/2=15.48m/s

Maximum height=15.48²/(2*9.8)=12.23 m

Trial 4

Time of flight=3.15 seconds

Initial velocity=9.8*3.15/2=15.43 m/s

Maximum height reached=15.43²/(2*9.8)=12.15 m

Trial 5

Time of flight=2.45 seconds

Initial velocity=9.8*2.45/2=12 m/s

Maximum height=12²/(2*9.8)=7.35 m

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