Help me please this test is due today!

Physics

2 answers:

aleksley [76]4 years ago

7 0

Answer:

v = 80.48 km/h.

Explanation:

We have,

Acceleration of a train is 2 km/h/s or 7200 km/h²

Initial velocity of a train is 20 km/h

It is required to find the velocity after 30 seconds or 0.0084 h

Let v is the final speed. Using equation of kinematics as :

$v=u+at\\\\v=20+7200\times 0.0084\\\\v=80.48\ km/h$

So, the final speed of the train is 80.48 km/h.

Zinaida [17]4 years ago

7 0

Answer:

Explanation:

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mrs_skeptik [129]

Answer:

Explanation:

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4 0

3 years ago

What is the net force when forces applied are 300 N to the right and 100 N to the right

labwork [276]

Answer:

400 Newtons to the right.

Explanation:

You have 300 Newtons that are being applied to the right and you also 100 Newtons to the right. When calculating net force with the forces that go the same direction, you add them. 300 plus 100 is 400. Therefore, it is 400 Newtons or N to the right. Hope this helps!

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3 years ago

What is the best estimate for the time required for an object in free fall (Vi = 0) with air resistance to travel 313.6 m.

kari74 [83]

Answer:

$s = v_it + \frac{1}{2} g {t}^{2} \\ t = \sqrt{2 \frac{s}{g} } \\ t = \sqrt{2 \times \frac{313.6}{9.81} } \: sec \\ = 7.995 \: sec \approx \: a \: little \: less \\ than \: 8 \: sec$