train travels 1/4of its total distance over half of its time with a constant velocity of 5m/s. calculate the average velocity

Which seasons are the northern and southern hemispheres experiencing in the image? it is summer in both the northern and southern hemispheres. it is summer in the northern hemisphere and winter in the southern hemisphere. it is winter in both the northern and southern hemispheres. it is winter in the northern hemisphere and summer in the southern hemisphere.

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?