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finlep [7]
3 years ago
14

A stone is thrown from a cliff and lands in the sea. Air resistance is negligible. Which statement is correct whilst the stone i

s in motion?
vertical component of stone's displacement is constant
horiz. comp. of stone's displacement is constant
vertical component of stone's velocity is constant
horiz. comp. of stone's veolcity is constant
Physics
1 answer:
erik [133]3 years ago
4 0
Since the stone is travelling, the displacement cannot be constant. This leaves the last 2 choices as possibilities. Now consider the acceleration that can act on the stone. Acceleration due to gravity is the only one. That means the horizontal component of the stone has to be constant since there is no acceleration in the horizontal direction.
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Answer:

Time taken by the arrow to travel along to hit the ground is 0.55 seconds.

Explanation:

The only "force" acting on the "crossbow" to cause it to "hit" the ground is "gravity". There is no initial velocity downward when it shoot.

d=v_{i} t+\frac{1}{2} t^{2}

d = the displacement of the object  

t = the time for which the object moved  

a = acceleration of the object  

v_i = the initial velocity of the object

Given values

d = 1.5 m

t = unknown

a=g=9.8 \mathrm{m} / \mathrm{s}^{2}

\mathrm{V}_{\mathrm{i}}=0 \mathrm{m} / \mathrm{s}

1.5 \mathrm{m}=0(\mathrm{t})+\frac{1}{2}\left(9.8 \mathrm{m} / \mathrm{s}^{2}\right) \mathrm{t}^{2}

1.5=0+4.9 \mathrm{t}^{2}

\mathrm{t}^{2}=\frac{1.5}{4.9}

t^{2}=0.306 \mathrm{s}

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t=\sqrt{0.306}

t = 0.55 s

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3 years ago
Which statement best compares potential and kinetic energy?
DaniilM [7]

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Explanation: probably that one

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2 years ago
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sesenic [268]

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Answer:

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Explanation:

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