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A particle is thrown with speed u at an ...

A particle is thrown with speed `u` at an angle of projection `theta` with horizontal as shown.

(i) The avergae velocity of particle from `O` to `A` is `u cos theta`
(ii) The average velocity of particle from `O` to `H` (highest point) is `(u)/(2) sqrt(1 + 3 cos^(2) theta)`
(iii) The average velocity of particle from `J` to `K` is `u cos theta`
(iv) The angle between the velocity and the acceleration between `O` and `H` is greater than `90^(@)`, between `H` to `A` is less than `90^(@)` and at highest point is `90^(@)`

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