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snow_lady [41]
3 years ago
8

Assume that a person bouncing a ball represents a closed system. Which statement best describes how the amounts of the ball's po

tential and kinetic energy change?
A. Both the kinetic and potential energy of the ball increase
B.The ball's potential energy decreases as it rises and it's kinetic energy increases
C. The ball's kinetic energy increases as it falls and its potential energy decreases
D. Both the kinetic and potential energy of the ball decrease

PLEASE HELP ME ASAP THIS IS IMPORTANT
Physics
1 answer:
Zinaida [17]3 years ago
7 0

Answer:

C.

Explanation:

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The graph at the right shows the force needed to pull a bow back as the string is pulled further and further.
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A. 9 J

In a force-distance graph, the work done is equal to the area under the curve in the graph.

In this case, we need to extrapolate the value of the force when the distance is x=30 cm. We can easily do that by noticing that there is a direct proportionality between the force and the distance:

F=kx

where k is the slope of the line. We can find k, for instance chosing the point at x=5 cm and F=10 N:

k=\frac{F}{x}=\frac{10 N}{5 cm}=2 N/cm

And now we can calculate the work by calculating the area under the curve until x=30 cm, F=60 N:

W=\frac{1}{2} (height) (base)= \frac{1}{2}(60 N)(0.30 m)=9 J


B. 24.5 m/s

The mass of the arrow is m=30 g=0.03 kg. The kinetic energy of the arrow when it is released is equal to the work done by pulling back the bow for 30 cm:

W=K=\frac{1}{2}mv^2

where m is the mass of the arrow and v is its speed. By re-arranging the formula and using W=9 J, we find the speed:

v=\sqrt{\frac{2W}{m}}=\sqrt{\frac{2\cdot 9J}{0.03 kg}}=24.5 m/s

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125÷2= 62.5 is your average speed. If the train was resting it's not moving your going nowhere . If the train is traveling at constant speed in a straight line it's speed will increase going through mountains will slow it down. if the train is coming to a braking force its speed will decrease

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