Which of the following answers describe how to calculate the acceleration of an object?
2 answers:
A. Divide the change in the objects velocity by the time it takes to make that change.
Explanation:
Acceleration is a vector quantity whose magnitude is given by the following equation:
where
is the change in velocity of the object
is the time it took to make the change in velocity
Therefore, we see that this equation corresponds to choice A.
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Answer:
option A
Explanation:
given,
lamp position from pool wall = 2.5 m
height of the pool = 2.5 m
now,
from the triangle
θ = i = 45°
using Snell's law
n₁ sin i = n₂ sin r
n₁ =4/3 n₂ = 1
now,
r = sin⁻¹(0.9428)
r = 70.5°
hence, the correct answer is option A
