When an item is raised, the work is done in opposition to gravity. When an item is worked on, energy is transmitted to it, and it develops gravitational potential energy. If the same thing falls from that height, gravity must do the same amount of effort to bring it back to the Earth's surface.
Answer: b
Explanation:
Ec= (1/2)m × v^2
By the formula, you can see that the bigger the mass, the bigger the Cinetic Energy.
Solution :
Part A .
Given : The 
and 
components of the vector, d = 
degree left of -axis.
So the component is = -4 x sin (29°) = -1.939 km
component is = 4 x cos (29°) = 3.498 km
Part B
Given : The and components of the vector, 
, 
So the component is = -2 cm/s
component is = 0
Part C
Given : The and components of the vector, 
left of -axis.
So the component is = -13 x sin (36°) = -7.6412 
component is = -13 x cos (36°) = -10.517
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