PROJECTILE MOTION PROBLEMS WITH ENERGY Projectile Motion ...
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PROJECTILE MOTION PROBLEMS WITH ENERGY Projectile Motion ...
NOTE: Problems that require TIME to be solved cannot be solved with Energy; instead we use . Ki + Ui + WNC = Kf + Uf. WN
PROJECTILE MOTION PROBLEMS WITH ENERGY
Ki + Ui + WNC = Kf + Uf
WNC = WYOU + Wf
● Projectile Motion problems asking for speeds or heights are easier to solve using Conservation of Energy. EXAMPLE 1: You throw a 5-kg object from the top of a 30 m-tall building with 20 m/s directed at an unknown angle above the horizontal. The object reaches a maximum height of 40 m. Ignoring air resistance, calculate the object’s speed: (a) at points B, C, and D; (b) at D had it been thrown at any angle below the x-axis.
B
A
C
D
EXAMPLE 2: You throw a ball with 20 m/s at 37o above the horizontal. Use Conservation of Energy to find its max. height.
NOTE: Problems that require TIME to be solved cannot be solved with Energy; instead we use ___________________.
