Figure 2 shows a man of 65 kg playing skateboard. He had an initial speed of 3 m/s when descending the stairs at a height of 2.5m. Calculate the man's potential energy when his speed is 7m/s.
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starts down the left side of the ramp with an initial speed of 5.4 m/s. Neglect nonconservative forces, such as friction and air resistance, and find the height h of the highest point reached by the skateboarder on the right side of the ramp.
Since we are ignoring non-conservative forces then mechanical energy must be conserved.
Assume the zero of gravitational potential energy is at the initial height.� We also know the height the skateboarder reaches is the height at which the skateboarder�s speed has gone to zero.
Therefore we have the following relationship
Solving for hafter
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