﻿ 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.

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

Time taken by the body to reach the ground:

We know that,

Velocity of the body at ground:

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

vx = ux + ax t = u

vy = uy + ayt = g

So, velocity, v =

=

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