According to the Guinness Book of World Records, the longest home run ever measu

Question

According to the Guinness Book of World Records,the longest home run ever measured was hit by Roy “Dizzy” Carlyle in a minor league game. The ball traveled 188 m (618 ft) before landing on the ground outside the ballpark.

Part A

Assuming the ball's initial velocity was 49 above the horizontal and ignoring air resistance, what did the initial speed of the ball need to be to produce such a home run if the ball was hit at a point 0.9 m (3.0 ft) above ground level? Assume that the ground was perfectly flat.

Express your answer using two significant figures.

Part B

How far would the ball be above a fence 3.0 m (10 ft) high if the fence was 116 m (380 ft) from home plate?

Express your answer using two significant figures.

Explanation / Answer

A) Y =Uyt - 0.5gt^2

-0.9 = u sin 49*t - 0.5*(9.8)*t^2 ------------(1)

X = Ux*t

188 = u cos 49 *t

t = 286.56 /u ---------(2)

-0.9 = u sin 49 * 286.56 / u - 4.9t^2

t = 6.657 s

u = 286.56 / 6.657 = 43.04 m/s

b) X = Ux*t

(188-116) = 43.04cos 49*t

t = 2.55 s

Y = Uy*t - 0.5gt^2

Y = 43.04*sin 49*2.55- 0.5*9.8*2.55^2

= 50.96 = 51 m

so height above the fence= 51 - 3 = 48 m

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