Answer:
The ball has kinetic energy
the kinetic energy is 945 J
Explanation:
90km per hour. Speed = distance÷time Speed= 225/2.5. Speed = 90Km per hour
I haven´t learned that yet I´m sorry.
Answer:
2.92682 m

250000000000 Hz

0.21126 m
0.12244 m
Explanation:
c = Speed of light = 
= Wavelength
f = Frequency
Wavelength is given by

The wavelength is 2.92682 m
Frequency is given by

The frequency is 

The frequency is 250000000000 Hz

The wavelength is 

The wavelength is 0.21126 m

The wavelength is 0.12244 m