a tennis ball with the mass of 40g has the velocity of 8.1 m/s upward. what is that kinetic energy of the tennis ball

Question

a tennis ball with the mass of 40g has the velocity of 8.1 m/s upward. what is that kinetic energy of the tennis ball

 

Answer 1

K = mv²/2 = (0.040 kg)(8.1 m/s)²/2 J = ? J

 

By the way, the direction of the velocity does not matter here, since kinetic energy is a scalar quantity.