g = 10 m/s 2 Football is thrown horizontally at the speed of 30 m/s from awindow
ID: 1669220 • Letter: G
Question
g = 10 m/s2 Football is thrown horizontally at the speed of 30 m/s from awindow 10m high, and it lands on a street below. a. How long is the ball in the air? b. How far from the base of the building will it hit theground? c. What is the vertical speed of the ball, right beforeimpact? g = 10 m/s2 Football is thrown horizontally at the speed of 30 m/s from awindow 10m high, and it lands on a street below. a. How long is the ball in the air? b. How far from the base of the building will it hit theground? c. What is the vertical speed of the ball, right beforeimpact? Football is thrown horizontally at the speed of 30 m/s from awindow 10m high, and it lands on a street below. a. How long is the ball in the air? b. How far from the base of the building will it hit theground? c. What is the vertical speed of the ball, right beforeimpact?Explanation / Answer
a. Let t be the time of the ball in the air. we have gt^2/2=h so t=sqrt(2hg)=sqrt(2*10*10)=14,14(s). --------------------------- Let d be the distance to the base. d=30*14,14=424(m). ----------------------------. vertical speed. v=g*t=10*14,14=141,4(m/s)
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