Answered

If an object is launched at an angle of 28° with an initial velocity of 133 ft./s from a height of 6 feet how many seconds will the object hit the ground?

Answer :

Answer:

Hence after  3.98 sec  i.e  4 sec Object will hit the ground  .

Step-by-step explanation:

Given:

Height= 6 feet

Angle =28 degrees.

V=133 ft/sec

To Find:

Time in seconds after which it will hit the ground?

Solution:

This problem is related to projectile motion for object

First calculate the Range for object  and it is given by ,

[tex]R=v^2Sin[/tex](2Ф)/[tex]g[/tex]

Here R= range  g= acceleration due to gravity =9.8 m/sec^2

1m =3.2 feet

So 9.8 m, equals to 9.8 *3.2=31.36 ft

So g=31.36 ft/sec^2. and 2Ф=2(28)=56

[tex]R=133^2*Sin(56)/31.36[/tex]

[tex]R=14664.84/31.36[/tex]

[tex]R=467.62[/tex]  fts

Now using Formula for time and range as

[tex]R=VxT[/tex]

Vx is horizontal velocity

[tex]Vx=V*cos[/tex]Ф

[tex]Vx=133*cos[/tex](28)

[tex]Vx=117.43[/tex]  ft/sec

So above equation becomes as ,

[tex]467.62=117.43*T[/tex]

[tex]T=467.62/117.43[/tex]

[tex]T=3.98 sec[/tex]

T is approximately equals to 4 sec.

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