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Anvisha [2.4K]
3 years ago
15

A car goes from rest to a speed of 90 km/h in 10 seconds . What is the car's acceleration in m/s²

Physics
1 answer:
prisoha [69]3 years ago
7 0
First you must convert Km/hr to m/s. 90 km/hr equals 25m/s (this can be done through a conversion table by plugging in the conversion values). Then you need to see what was given:
vi (initial velocity)= 0m/s
vf (final velocity= 25m/s (90km/hr)
t (time)= 10s

Next you should find an equation that requires only the values you know and gives you the value you're looking for. Sometimes that requires two equations to be used, but in this case you only need one. The best equation for this would be a=(vf-vi)/t. Finally, plug in your values (a=(25-0)/10) to get your answer which would be 2.5m/s^2. Hope this helped!
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From this question, the plane is still up in the air.

We have wind blowing in [W 60° N ]

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We put the values in the equation, we have:

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The next step is to cross multiply

50 x sin60° = 200Sinθ

50 x 0.8660 = 200sinθ

We make Sin θ the subject

Sine θ = 43.30/200

sine θ = 0.2165

we find the value of θ

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θ = 12.50

So Lindsay has to fly this plane towards this direction

[W 12.5° S]

Here is a similar question brainly.com/question/13338067?referrer=searchResults

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A very long train is rolling at 4 m/s along a straight track. An observer is standing on the ground very dangerously close to th
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Answer:

A. \vec{r}=(6\frac{m}{s})t\ \ \hat{i}

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Explanation:

A. The vectorial equation of the person who is getting closer to the other person is:

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Then, you replace and obtain:

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t=\frac{d}{v}

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