here,
15)
the velocity of cart at point 1 , v1 = 40 m/s
the height of point 1 , h1 = 0 m
the height of point 3 , h3 = 10 m
let the velocity at point 3 be v3
using conservation of energy
0.5 * m * v1^2 + m * g * h1 = 0.5 * m * v3^2 + m * g * h3
0.5 * 40^2 = 0.5 * v3^2 + 9.81 * 10
solving for v3
v3 = 37.46 m/s
the velocity at point 3 is 37.46 m/s
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