Respuesta :
it is the first equation - the -4.9 comes form the acceleration of gravity = 9.8 m s-2
The + 1.5 from the 1 5 metres above the ground from which she throws the javelin
The + 1.5 from the 1 5 metres above the ground from which she throws the javelin
Answer:
Option first is correct!
Step-by-step explanation:
When an object is thrown above the ground then equation in terms of time (t)
is given by
[tex]-\frac{1}{2} gt^2+vt+h=0[/tex]
where g is acceleration due gravity and v is the initial velocity and h is height above the ground at which it is thrown
since here height and speed is given in MKS system
therefore value of g is also in meter second
that is g = 9.8[tex]ms^-2[/tex]
so equation is given by
[tex]-4.9t^2+22t+1.5 =0[/tex] since half of g is 9.8 divided by 2 gives 4.9
