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katen-ka-za [31]
2 years ago
5

A train moves from rest to a speed of 25 m/s in 30.0 seconds. What is the acceleration?

Physics
1 answer:
fredd [130]2 years ago
4 0

Answer:

a = 0.83\ m/s^2

Explanation:

<u>Uniform Acceleration </u>

When an object changes its velocity at the same rate, the acceleration is constant.

The relation between the initial and final speeds is:

v_f=v_o+a.t

Where:

vf  = Final speed

vo = Initial speed

a   = Constant acceleration

t   = Elapsed time

It's known a train moves from rest (vo=0) to a speed of vf=25 m/s in t=30 seconds. It's required to calculate the acceleration.

Solving for a:

\displaystyle a=\frac{v_f-v_o}{t}

Substituting:

\displaystyle a=\frac{25-0}{30}

\boxed{a = 0.83\ m/s^2}

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If the speed of a wave is 1500m/sec and its frequency is 200 Hz, what is its wavelength
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