Answer:
7 seconds
Explanation:
Let's first write down what we have so that we can choose the correct equation of linear motion
initial velocity (u) = 0 m/s
distance (x) = h = 240 m
acceleration (a) = g = 9.81 m/s²
\(s = ut + \frac{at^{2} }{2} \\\\240 = (0)(t) + \frac{9.81t^{2} }{2}\\ \\9.81t^{2} = 480\\\\t = 6.99s\\\\t = 7 s\)
