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12345 [234]
3 years ago
13

17. A distance-time graph indicates that an object moves 120 meters in 5 seconds and then remains at rest for 5 seconds. What is

the average speed of the object?
Physics
1 answer:
irina1246 [14]3 years ago
3 0

Answer:

12 m/s

Explanation:

Speed is distance moved per unit time and expressed as

S=d/t

S is speed, d is distance and t is time.

When at rest for five minutes, distance moved is zero hence speed is 0/5=0 m/s

When having moved 120 m for 5 s then speed is

S=120/5=24 m/s

Average speed is the average of these two speeda

Average speed=(24+0)÷2=24/2=12 m/s

Therefore, average speed is 12 m/s

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A projectile is launched at an angle of 30° from the horizontal and lands 69 s later at the same height from which it was launch
RideAnS [48]

Answer:

679.2 m/s

Explanation:

The formula for the time of flight of a projectile is given as,

T = 2usinФ/g ......................... Equation 1

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make u the subject of the equation

u = Tg/2sinФ....................... Equation 2

Given: T = 69 s, Ф = 30°

Constant: g = 9.8 m/s²

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u = (69×9.8)/(2×sin30)

u = 679.2 m/s.

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3 years ago
Which of these would best represent the effect of an embargo on trade with China?
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4 years ago
What is the magnification formula?
erica [24]

Answer:

the height of the image ÷ by the height of the object.

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4 years ago
We’ve already investigated this problem with one spring scale in Think About 34.1. Now, imagine you have two spring scales, A an
Debora [2.8K]

Answer:

Explained

Explanation:

1.Each of the spring scale will read 10N,considering acceleration due to gravity as 10 m/s^2

2.Each of the spring scale will read 10N because each string exerts a force of 10 N to counterbalance the force of 1 kg mass attached to it. This means the tension on the both side of the string is 10 N. So the scale will read 10 N. Also as spring balances are attached in series and kept on table so both spring balances will read same readings.

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