Six packages were bought. Just count by 2's until you reach 12.
Answer:
55.5 kg.
Step-by-step explanation:
Potential energy = mgh
= m * 9.81 * 4.5 = 2450 where m is the mass of the man.
m = 2450 / (9.81* 4.5)
= 55.5 kg.
Are you looking for the name of the method? If so, it's called completing the square.
-10.6, and 9/10, are the constants
