ur answer is A or also known as
When you push a child on a swing, you are doing work on the child because you are pushing against the force of gravity
hope this helps :)
Answer:
B. Cant stop things from going wrong.
Explanation:
To me it's the only reasonable answer...
He doesn't lose weight he stays the same weight it's just gravity that changes
Answer:
v = 12.12 m/s
Explanation:
Given that,
The mass of the cart, m = 75 kg
The roller coaster begins 15 m above the ground.
We need to find the velocity of the cart halfway to the ground. Let the velocity be v. Using the conservation of energy at this position, h = 15/2 = 7.5 m

So, the velocity of the cart is 12.12 m/s.