Question: having problems with this problem the arrow is shot vertically upward at a rate of180ft/s use the projectile formula -16t^2+v0t to determine at what time

having problems with this problem the arrow is shot vertically upward at a rate of180ft/s use the projectile formula -16t^2+v0t

to determine at what time in seconds he arrow is at a height of420ft

. it says round the answers to the nearest tenth of a second.

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