Chapter 1

The maximum ground speed of a chicken is \(14 \mathrm{~km} \cdot \mathrm{h}^{-1}\). Calculate the kinctic energy of a chicken of mass \(4.2 \mathrm{~kg}\) crossing a road at its maximum speed.

Mars orbits the \(5 u n\) at \(25 \mathrm{~km} / \mathrm{s}^{-1}\). A spuceship attempting to land on Mars must match its orbital speed. If the mass of the spaceship is \(2.5 \times 10^{5} \mathrm{~kg}\), what is its kinetic energy when its speed has matched that of Mars?