The graph in diagram shows the displacement-time graph of a roller skater. Calculate
a) The maximum velocity of the skater
b) The velocity of the skater when he returns to his
original position
c) The displacement of the skater when t= 50 s
d)The average velocity throughout the whole
journey
e) Average speed throughout the whole journey

Can someone explain to me how to do this problem ?

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island