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Example: Finding the range of a projectile
For the previous example of the out of control bus which is forced to jump from a location ⟨0,40,−5⟩ with an initial velocity of ⟨80,7,−5⟩. We have now found the time of flight to be 9.59s and now want to find where the bus returns to the ground?
Facts
Lacking
Approximations & Assumptions
Representations
Solution
First find vfy for when it hits the ground. We need this in order to find →vavg
Vfv=Viy+(Fnet,ym)Δt
=Viy+(−mgm)Δt
=Viy−gΔt
=7m/s−(9.8Nkg)(9.59s)
=−87m/s
Now to find the range:
→rf=→ri+→vavgΔt
=→ri+→vi+→vf2Δt