Answer to Question #128576 in Physics for Drake

Question #128576
a model rocket is launched from a raised platform at a speed of 144 ft./s it's height in feet is given by h(f)= -16t squared plus 144 t+20 (t=seconds after launch) After how many seconds does the object reach its maximum height
1
Expert's answer
2020-08-05T16:41:43-0400

h(t)=16t2+144t+20h(t)=-16t^2+144t+20


dh(t)dt=032t+144=0t=144/32=4.5(s)\frac{dh(t)}{dt}=0\to -32t+144=0\to t=144/32=4.5(s)


After 4.5(s)4.5 (s).


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