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Akimi4 [234]
3 years ago
12

I need help this is due today GIVING BRAINLIEST IM DESPERATE!

Physics
1 answer:
Nitella [24]3 years ago
3 0

Answer:

1: is A

2: is C

Explanation:

1: because all other option would imply that the truck was not moved from from its previous position due to the lack of work / force exerted by the car

2: this is because the less dense ball will have less opposing force action on it causing it to move / accelerate / go at a faster speed

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3 years ago
Barry walks from one end to the other of a 30-meter long moving walkway at a constant rate in 30 seconds, assisted by the walkwa
Kisachek [45]

Answer:

A. 48 seconds

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In one part of the journey the moving walkway helps Barry to arrive faster but does the opposite in the second part of the journey. Let us define B as Barry’s speed and W as the speed of the walkway. We can set two equations as it follows:

B+W = (30 m)/(30 s) =1 m/s

B-W = (30 m)/(120 s) =0,25 m/s

If we add both equations, the speed of the walkway cancels itself and we have:

2*B = 1+0,25 = 1,25 m/s

B = (1,25 m/s)/2 = 0,625 m/s

Knowing Barry’s speed and applying the definition of velocity, we can find the time that it would take him to walk from one end of the walkway to the other without assistance.

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Have a nice day! :D

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4 years ago
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