m = 400 grams = 0.4 kilograms – the mass of the pigeon;
v = 61 kilometers per hour – the speed of the pigeon.
It is required to determine W (Joule) – the kinetic energy of the pigeon.
Let’s convert the units of measurement of speed from kilometers per hour to meters per second:
v = 61 km / h = 61 * 10/36 = 17 meters per second.
Then the kinetic energy of the pigeon will be equal to:
W = m * v ^ 2/2 = 0.4 * 17 ^ 2/2 = 0.4 * 289/2 = 0.2 * 289 = 57.8 Joules.
Answer: The pigeon has a kinetic energy of 57.8 Joules.
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