ï»¿ A projectile is fired with velocity u horizontally from height h. With what velocity will it strike the ground? from Physics Motion in A Plane Class 11 Manipur Board

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A projectile is fired with velocity u horizontally from height h. With what velocity will it strike the ground?

Consider a projectile being projected with velocity 'u' horizontally from height 'h'.

Let the projectile strike the ground with velocity 'v' after time t.Â

Â  Â  Â  Â  Â  Â  Â Â

Now, on resolving the components of velocity aong vertical and horizontal direction, we haveÂ

Time taken by the body to reach the ground:Â

We know that,Â

Velocity of the body at ground:Â

Let, vx and vy be the components of velocity along X-axis and Y-axis respectively.Â

vx = ux + ax t = uÂ

vy = uy + ayt = g

So, velocity, v =Â

Â =Â

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