What is the kinetic energy in J of a 66 g tennis ball approaching a tennis racket at 11.9 m/s?
1/2 m v^2
To determine the kinetic energy of an object, you need to use the formula:
Kinetic Energy = (1/2) * mass * velocity^2
In this case, the mass of the tennis ball is given as 66 g, which is equivalent to 0.066 kg (since 1 kg = 1000 g). The velocity is given as 11.9 m/s.
Now, plug these values into the formula to find the kinetic energy:
Kinetic Energy = (1/2) * 0.066 kg * (11.9 m/s)^2
Calculating this expression:
Kinetic Energy = (1/2) * 0.066 kg * (11.9 m/s)^2
= (1/2) * 0.066 kg * 141.61 m^2/s^2
= 0.033 kg * 141.61 m^2/s^2
≈ 4.68 Joules (J)
Therefore, the kinetic energy of the 66 g tennis ball approaching the tennis racket at 11.9 m/s is approximately 4.68 Joules (J).