Answer:
Kinetic energy is 1000 J.
Explanation:
Given:
Mass of the bicycle, [tex]m=80\textrm{ kg}[/tex]
Distance traveled, [tex]d=100\textrm{ m}[/tex]
Time of travel, [tex]t=20\textrm{ s}[/tex]
Unknowns:
Speed of the bicycler, [tex]v[/tex].
Kinetic energy of the bicycler.
Equation:
Speed of the bicycler is, [tex]v=\frac{d}{t}=\frac{100}{20}=5\textrm{ m/s}[/tex]
Therefore, the kinetic energy of the bicycler is given as,
[tex]KE=\frac{1}{2}mv^{2}[/tex]
Substitute:
Plug in 5 m/s for [tex]v[/tex] and 80 kg for [tex]m[/tex]. Solve for KE.
Solve:
[tex]KE=\frac{1}{2}\times 80\times (5)^{2}\\KE=40\times 25=1000\textrm{ J}[/tex]
Therefore, his kinetic energy is 1000 J.
