Name A. A ball is thrown upward in two dimensions with an initial speed of 17 zl
ID: 1587800 • Letter: N
Question
Name A. A ball is thrown upward in two dimensions with an initial speed of 17 zlugs per megahandles, near the surface of the planet Earth. What will be the y component of the ball's velocity at the peak of its trajectory? B. Consider the projectile motion of aball in two dimensions. 1. Where if anywhere is the speed o? Answer below, mark the point, and label it clearly on the graph. 2. Where if anywhere is the acceleration o? Answer below, mark the point, and label it clearly on the graph. 3. Where if anywhere is v 0? Answer below, mark the point, and label it clearly on the graph. 4. where if anywhere is v, 0? Answer below, mark the point, and label it clearly on the graph. 5. How does the speed of the ball change with time? Circle the correct answer a. It increases. b. It decreases. c. It stays the same. d. It varies, increasing on its way up and decreasing on its way down. e. It varies, decreasing on its way up and increasing on its way down. f Not enough information to answer this question.Explanation / Answer
1)
Speed is not 0 at any point .the projectile has 0 vertical speed at the highest point but it has horizontal speed there. hence net speed is nowhere 0
2)
acceleration acting on the projectile is acceleration due to gravity acting in downward direction. hence acceleration is not 0 anywhere
3)
Vx = 0 , Horizontal velocity is constant throughtout the motion of the projectile , hence it is never 0
4)
Vy = 0, at the highest point , the projectile comes to a momentary rest in vertical direction.
5)
e)
as the projectile moves up , its speed decreases as acceleration acts in opposite down direction. as the projectile moves down , its speed increases as acceleration acts in same direction down.
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