An object is dropped from a height H above the ground. This free-falling object requires 1.02 s to travel the last 39 m before hitting the ground. From what height H above the ground did the object fall?

Respuesta :

Answer:

H = 95.3 m

Explanation:

Let the height from which object fall down is H

so the total time to fall is given as

[tex]H = \frac{1}{2}gt^2[/tex]

now it cover 39 m in last 1.02 s of its path

[tex]H - 39 = \frac{1}{2}g(t - 1.02)^2[/tex]

so now we have

[tex]\frac{1}{2}gt^2 - 39 = \frac{1}{2}g(t - 1.02)^2[/tex]

by solving above equation

[tex]t = 4.41 s[/tex]

Now the total height is given as

[tex]H = \frac{1}{2}gt^2[/tex]

[tex]H = \frac{1}{2}g(4.41)^2[/tex]

H = 95.3 m

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