The discussion revolves around determining the initial velocity of a projectile given its flight time and launch angle. The subject area includes concepts of projectile motion, specifically focusing on the vertical and horizontal components of motion.
The discussion is active, with participants providing insights and questioning assumptions about the motion of the projectile. Some guidance has been offered regarding the importance of vertical motion equations in projectile problems, and there is an ongoing exploration of the symmetry in vertical motion.
Participants are navigating through the implications of time of flight and the effects of gravity on projectile motion. There is a mention of the assumption that launch and landing occur at the same height, which is relevant to the discussion of initial and final velocities.
No. The projectile is always moving and its velocity is never zero. The equations that you have are valid from the time it starts moving until just before the projectile hits the ground.Asem said:can I say final velocity is equal to zero?
Good! Remember this for future reference: In projectile motion problems that give you the time of flight (or ask you to find the time of flight), always start with the equations for the vertical motion. That's because the value of g is what determines how long a projectile stays in the air.Asem said:Vf=0, when t=1s
Vf=Viy+at
Viy=9.8*1
Viy=Visin
9.8=Visin(40)
Vi=15.2
Thank you, sir
Yes.Asem said:I just have one more question; Vertical motion is symmetric in projectile right? So, is Initial velocity = Final velocity? If projectile is launched from ground level I mean.
No. When the projectile returns to the same level, the final speed is the same as the initial speed. The horizontal component of the velocity is the same while the final vertical component has the same magnitude but opposite direction from the initial component.Asem said:I just have one more question; Vertical motion is symmetric in projectile right? So, is Initial velocity = Final velocity? If projectile is launched from ground level I mean.