What kinetic energy does a tennis ball with a mass of m = 60 g, flying at a speed of v = 180 km / h, have?

We calculate the kinetic energy of tennis by the formula:

Ek = m * V² / 2, where m is the mass of a tennis ball (m = 60 g = 0.06 kg), V is the flight speed of a tennis ball (V = 180 km / h = 180 * 1000/3600 m / s = 50 m / s).

Let’s calculate the kinetic energy of a tennis ball:

Ek = m * V² / 2 = 0.06 * (50) 2/2 = 0.06 * 2500/2 = 75 J.

Answer: The tennis ball has a kinetic energy of 75 J.