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genyjoannerubiera
01.12.2020 •
Physics
2. A car starts from rest and accelerates uniformly to
reach a speed of 21 m/s in 7.0 s. What was the speed of
the object after 2.0 seconds?
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Ответ:
speed of object after 2 seconds will be 6 ms⁻¹
Explanation:
Initial velocity = 0
Final Velocity = 21 m/s
Time = 7 sec
We need to find speed of object after 2.0 seconds.
First we will find acceleration using formula:![Accelaration=\frac{change \ in \ velocity}{change \ in \ time}](/tpl/images/0938/6421/e767c.png)
Putting values:
Now finding speed of object after 2 seconds
The formula used will be:![Speed(v) = a\times t+v_0](/tpl/images/0938/6421/d41c3.png)
Putting values of a= 3m/s², t=2 sec and v₀=0 (at rest)
So, speed of object after 2 seconds will be 6 ms⁻¹
Ответ:
1)iodide produces fumes when heated - sublimation
2)An iceberg turns to ocean water - melting
3)Candle wax turns to liquid when hot - melting
4)Fog is created from dry ice - sublimation
explanation:
Melting is the substance changing from a solid to a liquid.Sublimation is when a substance changes directly from a solid to a gas without a liquid phase.
☃️ Hope this helps☃️