A 100kg golf ball. is moving to right with a velocity of 20m/s. it make a head on collision with 8kg stell ball, initially at rest compute velocity of ball after collision?

Need on both questionswill markbr />

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

What is the percentage of hydrogen in c2h4