Answer:
a) 0.78 s
b) 58.86m/s'
c) Galileo's law of free fall
Explanation:
a) [tex]x = v_{i}t + \frac{1}{2}at^{2} \\3 = 0*t+\frac{1}{2} *9.81*t^{2}\\t=\sqrt{\frac{6}{9.81} }[/tex]
b)At the bottom:
kinetic energy = potential energy
[tex]\frac{1}{2}mv^{2} = mgh\\ v^{2} =2*9.81*3=58.86m/s[/tex] downwards
c) Galileo's law of free fall says regardless of the masses, bodies in a vacuum will fall, on the earth, at the same acceleration
