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garik1379 [7]
4 years ago
7

A ball is thrown straight up in the air. Which of these statements about its kinetic energy is true?A ball is thrown straight up

in the air. Which of these statements about its kinetic energy is true?
A :The ball has the least kinetic energy at the end of its flight (before it is caught).

B: The ball has the least kinetic energy at the top of its flight.

C: The ball has the least kinetic energy at the start of its flight.

D: The ball has the most kinetic energy halfway to the top of its flight.
Physics
2 answers:
alexgriva [62]4 years ago
7 0
I believe the correct answer from the choices listed above is option B. The statement that is true about the kinetic energy would be that the <span>ball has the least kinetic energy at the top of its flight. Hope this answers the question. Have a nice day.</span>
SVEN [57.7K]4 years ago
6 0

Answer:

B: The ball has the least kinetic energy at the top of its flight.

Explanation:

As we know that the ball is thrown up into the air

so here the kinetic energy of the ball is initially vertically upwards and it is given by the person who throws up the ball

Now since the ball is moving up in the air so here motion of ball is under the deceleration due to gravity.

So as the ball is moving upwards the speed of the ball will decrease continuously and it will become zero as soon at ball will reach the top of its path

So here correct answer will be

B: The ball has the least kinetic energy at the top of its flight.

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What are the 3 ways to calculate the net force ?
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<span><span>An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.</span>
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4 0
4 years ago
The three forces shown act on a particle. what is the direction of the resultant of these three forces?
melisa1 [442]
Missing figure: http://d2vlcm61l7u1fs.cloudfront.net/media/f5d/f5d9d0bc-e05f-4cd8-9277-da7cdda3aebf/phpJK1JgJ.png

Solution:
We need to find the magnitude of the resultant on both x- and y-axis.

x-axis) The resultant on the x-axis is
F_x = 65 N\cdot cos 30^{\circ} - 30 N - 20 N\cdot sin 20^{\circ} = 19.45 N
in the positive direction.

y-axis) The resultant on the y-axis is
F_y = 65 N \cdot sin 30^{\circ} - 20 N \cdot cos 20^{\circ} = 13.70 N
in the positive direction.

Both Fx and Fy are positive, so the resultant is in the first quadrant. We can find the angle and so the direction using
\tan \alpha =  \frac{F_y}{F_x} = \frac{13.70 N}{19.45 N}=0.7
from which we find 
\alpha=35^{\circ}
7 0
4 years ago
The distance between two telephone poles is 50 m. A 1 kg bird lands on the telephone wire midway between the poles, and the wire
masha68 [24]

Answer:

the tension produce by the bird in the wire is 610.3 N.

Explanation:

given information:

mass of the bird, m = 1 kg

distance of two telephone pole, L = 50 m

wire sag, y = 0.2

the tension of the wire can be calculate by the following equation

tan θ = y/(L/2)

         = 0.2/(50/2)

         = 0.2/25

thus

θ = arc tan (0.2/25)

  = 0.46°

according to Newton's first law

ΣF = 0, vertical direction

T sin θ + T sin θ - mg = 0

2 T sin θ = m g

T = mg/2 sinθ

  = 1 x 9.8/(2 sin 0.46)

  = 610.3 N

3 0
4 years ago
Please I really need help on this
taurus [48]

The secondgfgghhhhhh

3 0
3 years ago
Read 2 more answers
A spring is 14cm long. Three masses are hung from it and then it is measured again. Now it is 19.5cm long. What force did the th
lukranit [14]

Answer:

Gravity

Explanation:

The answer is gravity because when the 3 masses were hung from the spring, gravity pulled the spring towards the ground.

3 0
3 years ago
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