S = ut + 1/2 at^2
a = 3.2 m/s^2
s = 15m
Find t
15 = 1/2(3.2)t^2
15 = 3.2t^2/2
30 = 3.2t^2
30/ 3.2 = 9.38
Square root of 9.38 = 3.06
It takes 3.06 seconds
The ultimate source of energy that powers the sun is the Mass energy of hydrogen fusing into helium, there is no other process than the annihilation of mass to give energy that has been advocated by Albert Einstein and it is capable of keeping the sun alive.
Armature is the correct answer.
The formulae for range and flight time for a given launch from ground level at angle θ are
<span>
R=<span><span><span>v2</span>sin2θ</span>g</span></span>
and
<span>
T=<span><span>2vsinθ</span>g</span></span>
these follow from the equations of motion and the parabolic/symmetric shape of flight without air resiatance
you can see that you will max out on range at
<span><span>
θ=<span>45o</span></span></span>
