A marble is fired horizontally from a 3.0m high shelf using a toy gun so that its launch velocity is 2.0m/s. You will use a y axis that points down for this problem since the projectile will not rise above the level of the shelf at all.   a)using the equation Δx=(1/2)gt2 find how long it takes until this projectile hits the ground   b)  using the eqn    x = vot for the horizontal part of the flight of this projectile determine how

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Chapter4: Motion In Two Dimensions
Section: Chapter Questions
Problem 4.7OQ: A projectile is launched on the Earth with a certain initial velocity and moves without air...
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A marble is fired horizontally from a 3.0m high shelf using a toy gun so that its launch velocity is 2.0m/s. You will use a y axis that points down for this problem since the projectile will not rise above the level of the shelf at all.

 

a)using the equation Δx=(1/2)gt2 find how long it takes until this projectile hits the ground

 

b)  using the eqn    x = vot for the horizontal part of the flight of this projectile determine how far from the base of the shelf the marble lands 

 

c)   find the landing speed by using energy conservation (hint: let the mass of the marble be m)

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