Point X lies on a horizontal line. We can intuitively say that the slope of the graph at point X is 0, therefore the acceleration at point X is 0m/s²
Point Y lies on a downward slanting line. To calculate the slope of that line, let's apply this equation:
m = (y₂-y₁)/(x₂-x₁)
m = slope, (x₁, y₁) and (x₂, y₂) correspond to the coordinates of the line's endpoints.
Given values:
(x₁, y₁) = (7, 5)
(x₂, y₂) = (12, 0)
Plug in and solve for m:
m = (0 - 5)/(12 - 7)
m = -1
The acceleration at point Y is -1m/s²
Choice A
Answer:B, universe, galaxy, solar system, earth
Explanation:
A p e x
Mars.
Water exists as small amounts of ice on Mars and as water vapor. It is suspected that Mars used to have flowing water on it, but that there is none left now.
Answer:
k = 2.65 10² N / m
Explanation:
As the pellets shoot up we can use energy conservation
Starting point. Compressed spring rifle
Em₀ = Ke = ½ k x²
Final point. Highest point of the path
= U = m g y
Energy is conserved
Em₀ = Em_{f}
½ k x² = m g y
k = 2 m g y / x²
Let's calculate
k = 2 1.06 10⁻² 9.8 6.26 / (6.61 10⁻²)²
k = 2.65 10² N / m
