yes it does the optimal ang
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if the bal is thrown by making 45 degree angles. with the ground..it will travel maximum distance...
travel horizontally
A ball thrown across a football field is an example of a projectile.
The displacement, along the direction of measurement, is zero. It need not mean that the object is back at the starting point. The displacement-time graph, measuring the vertical displacement of a ball thrown at an angle, will have displacement = 0 when the ball returns to ground level but, unless you are extremely feeble, the ball will be some distance away, not at its starting point which is where you are. The use of such a graph is not unusual in the elementary projectile motion under gravity.
10 m/s