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    Motion in A Plane
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    A body is projected from ground at certain angle with horizontal. Is there any point at which acceleration and velocity are parallel to each other?
    No, acceleration and velocity are never parallel to each other. 

    At the highest point, acceleration and velocity are perpendicular to each other. 
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    What is the maximum distance at which we can throw the body with speed u?

    Horizontal range will be maximum when sin 2 is maximum. 

    That is, 

       sin 2 = maximum 

     

    Therefore, maximum horizontal range is given by, 
     
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    At what point the momentum of projectile is minimum?
    Momentum of projectile is minimum at highest point because at the highest point the speed of the projectile is minimum. 
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    What is the angle between the velocity vector and acceleration vector in uniform circular motion?

    The angle between the velocity vector and acceleration vector is 90o. 

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    A projectile is aimed at angle θ, to hit the target. Can you hit the same target by aiming at some other angle?
    Yes, we can hit the same target by aiming at angle (90°–θ).
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