A spear is thrown with an atlatl (a spear throwing tool) from a kayak near the water's surface with an initial velocity of 208 feet per second. Assume the starting height of the spear is 0 feet. How long will it take the spear to hit the water's surface?

13 secs
21 secs
42 secs
6 secs

Question

A spear is thrown with an atlatl (a spear throwing tool) from a kayak near the water's surface with an initial velocity of 208 feet per second. Assume the starting height of the spear is 0 feet. How long will it take the spear to hit the water's surface?
 	
	13 secs
	21 secs
	42 secs
	6 secs

anonymous · Answer

but it doesn't give you the launch angle.

dan815 · Answer

man these questions are constructed horribly

dan815 · Answer

lets just assume the velocity is upward and the starting point = 0

anonymous · Answer

you see I thought I would just use the equation h(t)=-16t^2+vt+s but whenever I work it out I get the maximum height not the time it takes.

dan815 · Answer

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