highest point above the ground

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter4: Two-and-three Dimensional Motion
Section: Chapter Questions
Problem 70PQ
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During a fireworks display, a shell is shot into the air with an initial speed of 60.0 m/s at an angle of   30 degrees above the horizontal. The fuse is timed to ignite the shell just as it reaches its highest point above the ground.  Calculate the height at which the shell explodes. assuming no air resistance involved and g=10m/s^2

a)  90 m

b) 45 m 

c)  35 m 

d) 70 m

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