h(t)=−16t2+144t+20h(t)=-16t^2+144t+20h(t)=−16t2+144t+20
dh(t)dt=0→−32t+144=0→t=144/32=4.5(s)\frac{dh(t)}{dt}=0\to -32t+144=0\to t=144/32=4.5(s)dtdh(t)=0→−32t+144=0→t=144/32=4.5(s)
After 4.5(s)4.5 (s)4.5(s).
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