# What kinetic energy does an ostrich weighing 80 kg have, running at a speed of 72 / km h.

July 19, 2021 | education

| m = 80 kg.

V = 72 km / h = 20 m / s.

Ek -?

The kinetic energy of the body Ek is determined by the formula: Ek = m * V ^ 2/2.

Where m is the body mass, V is the speed of movement.

Let’s translate the speed V = 72 km / h into m / s.

A speed of 72 km / h means that the body travels a distance of 72 km in 1 hour.

Let’s find what distance the body travels in 1 second.

In 1 km = 1000 m, in 1 hour = 60 minutes = 3600 s.

V = 72 km / h = 72 * 1000 m / 3600 s = 20 m / s

Let’s convert km to meters, hours to seconds. For this 72 * 1000m / 1h * 60min * 60

Ek = 80 kg * (20 m / s) ^ 2/2 = 16000 J.

Answer: the kinetic energy of the ostrich Ek = 16000 J.

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