CBSE Class 11-science Answered
A particle is projected with a velocity v=(3i-j+2k) and a constant acceleration acting on the particle is a=(-6i+2j-4k) then path of projectile is
Asked by rawatvaishali2020 | 26 Nov, 2020, 22:21: PM
Path of projectile is determined using the equation of motion S = u t + (1/2) a t2 .................. (1)
where u is initial speed and a is acceleration
we are given :-
= ( 3
-
+ 2
) ........................(2)
![begin mathsize 14px style u with rightwards arrow on top end style](https://images.topperlearning.com/topper/tinymce/cache/01d5bf7cf541c93dc3a5862f3ecabbcc.png)
![begin mathsize 14px style i with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a5a79159fc1a127cc872f245943c4834.png)
![begin mathsize 14px style j with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/ef647306fae7d3b52276fc8b581df5b6.png)
![begin mathsize 14px style k with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a116bfa6de804b116d62ee7144453646.png)
and
= ( -6
+2
-4
) ......................(3)
![begin mathsize 14px style a with rightwards arrow on top end style](https://images.topperlearning.com/topper/tinymce/cache/d9ede463a364dc4ae9a804b43bf4b4bf.png)
![begin mathsize 14px style i with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a5a79159fc1a127cc872f245943c4834.png)
![begin mathsize 14px style j with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/ef647306fae7d3b52276fc8b581df5b6.png)
![begin mathsize 14px style k with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a116bfa6de804b116d62ee7144453646.png)
By substituting u and a in eqn.(1) , we get
![begin mathsize 14px style S with rightwards arrow on top end style](https://images.topperlearning.com/topper/tinymce/cache/0e4c7de77c46c02fe2347bd4e53b79e6.png)
![begin mathsize 14px style i with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a5a79159fc1a127cc872f245943c4834.png)
![begin mathsize 14px style j with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/ef647306fae7d3b52276fc8b581df5b6.png)
![begin mathsize 14px style k with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a116bfa6de804b116d62ee7144453646.png)
![begin mathsize 14px style i with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a5a79159fc1a127cc872f245943c4834.png)
![begin mathsize 14px style j with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/ef647306fae7d3b52276fc8b581df5b6.png)
![begin mathsize 14px style k with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a116bfa6de804b116d62ee7144453646.png)
By simplifying above expression , we get , S = ( t - t2 ) ( 3
-
+ 2
) ..............(4)
![begin mathsize 14px style i with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a5a79159fc1a127cc872f245943c4834.png)
![begin mathsize 14px style j with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/ef647306fae7d3b52276fc8b581df5b6.png)
![begin mathsize 14px style k with hat on top end style](https://images.topperlearning.com/topper/tinymce/cache/a116bfa6de804b116d62ee7144453646.png)
if we compare eqn.(4) and (2) , we get ,
= ( t - t2 ) ![begin mathsize 14px style u with rightwards arrow on top end style](https://images.topperlearning.com/topper/tinymce/cache/01d5bf7cf541c93dc3a5862f3ecabbcc.png)
![begin mathsize 14px style S with rightwards arrow on top end style](https://images.topperlearning.com/topper/tinymce/cache/0e4c7de77c46c02fe2347bd4e53b79e6.png)
![begin mathsize 14px style u with rightwards arrow on top end style](https://images.topperlearning.com/topper/tinymce/cache/01d5bf7cf541c93dc3a5862f3ecabbcc.png)
Answered by Thiyagarajan K | 26 Nov, 2020, 22:54: PM
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