Unit 3: Motion in TwoDimensions
Problem Set D
Problem 11:
A ball is thrown straight upward and returns to the thrower's hand after 3.5 s in the air. A second ball is thrown at an angle of 33.3 degrees with the horizontal. At what speed (in m/s) must the second ball be thrown so that it reaches the same height as the one thrown vertically?






v_{iy} = ??? t_{total} = 3.5 s t_{up} = 1.75 s a_{y} = 9.8 m/s/s v_{fy} = 0 m/s (@ t = 1.75 s) 
Important to this Problem 
v_{iy} = v_{i} • sin() a_{y} = 9.8 m/s/s v_{fy} = 0 m/s (@ peak) t = ??? 
A discussion of the formulae for projectile motion, of the trajectory characteristics and of the basic strategy for solving such problems is provided on the Set D Overview Page.
Detailed information about and discussion of the strategies for solving nonhorizontally launched projectile problems is provided online at The Physics Classroom.
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