Problem 2.48 - Enhanced-with Feedback ) 21 Of 24 rat A What was the greatest hei

Question

Problem 2.48 - Enhanced-with Feedback ) 21 Of 24 rat A What was the greatest height reached by the ball? Assume it is kicked from ground level Express your answer to two significant figures and include the appropriate units. Constants A football is kicked straight up into the air, it hits the ground 4.8 s later You may want to review (Pages 51-54) HA Value Units Submit Request Answer Part B With what speed dd·leave the kicker's foot? Express your answer to two significant figures and include the appropriate units , Value Units

Explanation / Answer

here,

time of flight , t = 4.8 s

for greatest height, the ball must be hit in vertical direction

let the initial speed be u

t = 2 * u /g

4.8 = 2 * u /9.81

solving for u

u = 23.5 m/s

a)

the maximum height , hm = u^2 /2g

hm = 23.5^2 /(2 * 9.81) m

hm = 28.3 m

b)

the initial speed is 23.5 m/s

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