On a sky coaster (human pendulum) that reaches 10 meters from it's equilibrium position, a man of 120 kg is able to reach a maximum speed of

18m/s

14m/s

1200m/s

11m/s

14 m/s

Explanation:

Using the principle of conservation of energy, the potential energy is converted to kinetic energy, assuming any losses.

Kinetic energy is given by ½mv²

Potential energy is given by mgh

Where m is the mass, v is the velocity, g is acceleration due to gravity and h is the height.

Equating kinetic energy to be equal to potential energy then

½mv²=mgh

V

Making v the subject of the formula

v=√ (2gh)

Substituting 9.81 m/s² for g and 10 m for h then

v=√ (2*9.81*10) = 14.0071410359145 m/s

Rounding off, v is approximately 14 m/s