Show that the trajectory of an object thrown at certain angle with the horizontal is a parabola .

Show that the trajectory of an object throw horizontally from certain height is a parabola.

A body is projected with a speed u at a angle theta with the horizonatl. The radius of curvature of the trajectory, when it makes an angle ((theta)/(2)) with the horizontal is (g-acceleration due to gravity)

What is the angles madeby the trajectory of a projectile with horizontal at maximum height ?

A projectile is thrown in the upward direction making an angle of 60^@ with the horizontal with a velocity of 140 ms^-1 . Then the time after which its velocity makes an angle 45^@ with the horizontal is (Acceleration due to gravity g=10 ms^-2 )

The elevation of an object on a hill is observed from a certain point in the horizontal plane through its base, to be 30^@ . After walking 120 metres towards it on level ground the elevation is found to be 60^@ . Then the height of the object (in metres ) is