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Find the average velocity of a projectil...

Find the average velocity of a projectile between the instants it crosses half the maximum height. It is projected with speed u at angle `theta` with the horizontal.

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`u cos theta` along horizontal
avg. velocity is a vector
first we will find vertical component
`V_(y)=("Total Displacement")/("Total time")=0`
Horizontal
`V_(1 x)=V_(2 x)=u cos theta`
`V_(x)=u cos theta`
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