A ball is thrown straight up. It passes a 2.00-m-high window 7.50 m off the ground on its path up and takes 1.30 s to go past the window. What was the ball's initial velocity?

Respuesta :

Answer:

u =  13.67 m/s

Explanation:

given,

window height = 2 m

window is 7.5 m off the ground on its path up

total distance from the ground to pass the window = 2 + 7.5 = 9.5 m

time taken to go past the window = 1.30 s

using equation of motion

[tex]S = u t +\dfrac{1}{2}gt^2[/tex]

[tex](2+7.5)= u\times 1.3 -0.5\times 9.8\times 1.3^2[/tex]

[tex]u\times 1.3 = 9.5 + 8.281[/tex]

u =  13.67 m/s

hence, the initial velocity of the  ball is equal to 13.67 m/s

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