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A projectile is fired with initial speed vo at an angle of 45o above the horizontal. Assume no air resistance. i: During the fli
Question
A projectile is fired with initial speed vo at an angle of 45o above the horizontal. Assume no air resistance.
i: During the flight, the x-component of the projectile’s momentum remains constant.
ii: During the flight, the y-component of the projectile’s momentum remains constant.
a) i is True and ii is False
b) i is True and ii is True
c) i is False and ii is True
d) i is False and ii is False
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Physics
4 years
2021-08-21T04:31:36+00:00
2021-08-21T04:31:36+00:00 1 Answers
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Answers ( )
Answer:
The correct answer is a
Explanation:
At projectile launch speeds are
X axis vₓ = v₀ = cte
Y axis
= v_{oy} –gt
The moment is defined as
p = mv
For the x axis
pₓ = mvₓ = m v₀ₓ
As the speed is constant the moment is constant
For the y axis
p_{y} = m v_{y} = m (v_{oy} –gt) = m v_{oy} – m (gt)
Speed changes over time, so the moment also changes over time
Let’s examine the answer
i True
ii False. The moment changes with time
The correct answer is a