The values in figure 1 shows h1 = 39 m, h2 = 13 m, h3 =
25 with a speed of 1.5m/s
The Initial speed u = 1.5m/s.
Vertical distance covered between point 1 and point 2 is
(39-13) =26m
The expanse 45 m is equal to a height of (45/6) =7.5 (As
frictional force is mg/6)
With the kinematics equation v^2 =u^2 + 2as
V^2 = 1.5^2 + 2*9.8 (26 + 7.5)
V = 25.7 m/s
