A particle is projected vertically upward from the ground with speed 30m/s. calculate the a) maximum height reached by the particle
b) time taken by the particle to return to the ground
c)time(s) taken for the particle to attain a height of 40m above the ground.

Asuppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer.

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

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.