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hardwick744
25.10.2019 •
Physics
Acar starting from rest accelerates at a rate of 12 m/s2. what is its final speed at the end of 4.0 seconds?
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Ответ:
48m/s
Explanation:
First, you have to identify the information the problem is giving you. A car starting from rest means that the initial speed is 0m/s. You also know the acceleration which is 12m/s² and the time which is 4s.
You can use the following formula to calculate the final speed:
Vf = Vo + at
The known values are:
Vo = 0m/s
a = 12m/s²
t = 4s
And now you substitute in the formula
Vf = 0m/s + (12m/s²)(4s)
Vf = 48m/s
So the final speed is 48m/s
Ответ:
Greenhouse gases in the air, mainly carbon dioxide, methane and water vapour, trap radiation from the Sun and act like a thermal blanket around the planet. Without the greenhouse effect, the Earth would have an average temperature of -18 °C and be covered in ice. Life as we know it would not be able to survive.
Explanation: