The answer is D.An ice cube melts when a person holds it in his hand
The heat from your body is causing the ice cube to melt
I think this is the answer. I hope you can understand.
The car's velocity is (distance + direction) / (time) =
(75 km-north) / (1.5 hrs) =
(75/1.5) (km-north/hr) = 50 km/hr north.
The basic relationship between frequency and wavelength for light (which is an electromagnetic wave) is

where c is the speed of light, f the frequency and

the wavelength of the wave.
Using

and

, we can find the value of the frequency:
It’s a total of 16 cm because it starts at 0 moves then moves to left then the right then the left