Help me solve this ASAP

Question

shaniehh · Answer

attachment

gabebae · Answer

Do you know how to use h(t)=-16t2+vt+h?

shaniehh · Answer

not really

gabebae · Answer

h(t)=-16t2+vt+h is the vertical motion formula

anonymous · Answer

−7(.8²)+11(.8)+4 = 8.32
−7(.7²)+11(.7)+4 = 8.27, seems less accurate. I'd go with the third option

gabebae · Answer

He needs to understand how to use it.. :/
I hate how I get warning for giving out answers while others don't

anonymous · Answer

Oh, sorry, didn't know you're not just supposed to answer.

gabebae · Answer

That's fine...

tkhunny · Answer

Why do you tink you know whether or not someone else receives a warning?  It's not public knowledge.

tkhunny · Answer

You should use the formulation provided by Gabe, but you should first notice that the problem is in meters. Thus, the formula provided by Gabe will not quite be suitable. Change that leading coefficient. This error can be quite expensive: http://articles.latimes.com/1999/oct/01/news/mn-17288