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A toy rocket is launched from a 1.4 m high platform in such a way that its height, h (in meters), after t seconds is given by the equation
h= -4.9t² +9.1t+1.4. How long will it take for the rocket to hit the ground?

Respuesta :

enkai59
h=-4.9t²+9.1t+1.4
sub h=1.4
1.4=-4.9t²+9.1t+1.4
-4.9t²+9.1t=0
now factorise the equation
(t-13/7)(t)=0
t=13/7 or
t=0(reject, t must be >0)

Therefore, t=13/7s

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