1)Throw a small ball (best a golf ball) straight upward as hard as you can. Your

Question

1)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.

            Please write here the equations you are using:

Trial 1

Trial 2

Trial 3

Trial 4

Trail 5

t

2.97

2.83

3.23

2.93

3.12

vo

hmax

2) What happens when you throw the ball at some angle other than 90o?

    

Does this change the time of flight? Explain.

Can you still determine the maximum height and the initial speed? Explain.

Trial 1

Trial 2

Trial 3

Trial 4

Trail 5

t

2.97

2.83

3.23

2.93

3.12

vo

hmax

Explanation / Answer

time of flight= 2*uy/g

uy=g*t/2=9.81*t/2=4.905*t

H=(uy)2/(2*g)=0.051uy2

trial 1

V=14.57 m/s

H=0.15 m

trial 2

V=13.88 m/s

H=0.144 m

trial 3

V=15.84 m/s

H=0.165 m

trial 4

V=14.37 m/s

H=0.15m

trial 5

V=15.3 m/s

H=0.16 m

2)

Time of flight only depends upon upward velocity so if the upward velocity is same then the time of flight will be same.

Maximum height will be same

and initial speed cant be determined as we cant get horizontal velocity.

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