A catapult launches a boulder with an upward velocity of 112 ft/s. The height of the boulder, h, in feet after t seconds is given by the function .
How long does it take the boulder to reach its maximum height? What is the boulder’s maximum height? Round to the nearest hundredth, if necessary.
A. 7 s; 30 ft
B. 3.5 s; 366 ft
C. 3.5 s; 618 ft
D. 3.5 s; 226 ft

Question

A catapult launches a boulder with an upward velocity of 112 ft/s. The height of the boulder, h, in feet after t seconds is given by the function .
How long does it take the boulder to reach its maximum height? What is the boulder’s maximum height? Round to the nearest hundredth, if necessary.
	A. 7 s; 30 ft 	
	B. 3.5 s; 366 ft 	
	C. 3.5 s; 618 ft 	
	D. 3.5 s; 226 ft

jtvatsim · Answer

what is the function?

anonymous · Answer

h=-16t^2+112t+30

anonymous · Answer

need help some one help me please

anonymous · Answer

h=-16t^2+112t+30

find vertex

-b/2a

-112/16*2

anonymous · Answer

that's your time , plug that number into h function ,you will get the height

anonymous · Answer

b?

anonymous · Answer

http://www.wolframalpha.com/input/?i=-112%2F%28-16*2%29 so 3.5 second plug that into h

anonymous · Answer

this sucks