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3 years ago

12. A sprinter has an acceleration of 5m/s” during the first 2 seconds of the race. What

Physics

1 answer:

Gala2k [10]3 years ago

7 0

Answer:

v=10m/s

Explanation:

$a=\frac{vf-vi}{t}\\ 5m/s^{2}=\frac{vf-0}{2}\\ vf=5*2\\vf=10 m/s$

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The answer to your question is C.

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4 years ago

7. You start to walk toward the east towards home at a constant speed of 4 km/hr. At the same time, Someone else leaves your hom

amm1812

A) position time graph for both is shown

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At one point they intersects which is the point where they both will meet

B) Let the two will meet after time "t"

now we can say that

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3 years ago

. During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from th

mixer [17]

Answer:

106.7 N

Explanation:

We can solve the problem by using the impulse theorem, which states that the product between the average force applied and the duration of the collision is equal to the change in momentum of the object:

$F \Delta t = m (v-u)$

where

F is the average force

$\Delta t$ is the duration of the collision

m is the mass of the ball

v is the final velocity

u is the initial velocity

In this problem:

m = 0.200 kg

u = 20.0 m/s

v = -12.0 m/s

$\Delta t = 60.0 ms = 0.06 s$

Solving for F,

$F=\frac{m(v-u)}{\Delta t}=\frac{(0.200 kg) (-12.0 m/s-20.0 m/s)}{0.06 s}=-106.7 N$

And since we are interested in the magnitude only,

F = 106.7 N

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marin [14]

Because the temperature remains constant, we can apply Boyle's Law which states that
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Apply Boyle's law.
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By halving the volume, the pressure doubles.

Answer:
The pressure increases by a factor of 2.

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3 years ago