A boat weighing 80 kg floats along the river. The current speed is 2 m / s. What kinetic energy does the boat have in the frame of reference associated with the shore?
In the frame of reference associated with the shore, the boat speed is equal to the current speed, because the boat sails without its own speed. The kinetic energy is Ek = m * v ^ 2/2 = 80 * 4/2 = 160J
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