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JulijaS [17]
2 years ago
9

(ASAP) would it be 125 m/s2 to calculate for her speeding up?

Physics
1 answer:
serg [7]2 years ago
8 0

Answer:

0\:\mathrm{ m/s^2}

Explanation:

Recall the formula for acceleration:

\displaystyle\\a=\frac{v_f-v_i}{\Delta t}, where v_f is final velocity, v_i is initial velocity, and \Delta t is elapsed time (change in velocity over this amount of time).

Let's look at our time vs velocity graph. At t=0 seconds, V=25 m/s. So her initial velocity is 25 m/s.

We want to find the acceleration during the first 5 seconds of motion. Well, looking at our graph, at t=5 seconds, isn't our velocity still 25 m/s? Therefore, final velocity is 25 m/s (for this period of 5 seconds).

We are only looking from t=0 seconds to t=5 seconds which is a total period of 5 seconds. Therefore, elapsed time is 5 seconds.

Substituting values in our formula, we have:

\displaystyle a=\frac{25-25}{5}=\frac{0}{5}=\boxed{0\:\mathrm{m/s^2}}

Alternative:

Without even worrying about plugging in numbers, let's think about what acceleration actually is! Acceleration is the change in velocity over a certain period of time. If we are not changing our velocity at all, we aren't accelerating! In the graph, we can see that we have a straight line from t=0 seconds to t=5 seconds, the interval we are worried about. This indicates that our velocity is staying the same! At t=0 seconds, we have a velocity of 25 m/s and that velocity stays the same until t=5 seconds. Even though we are moving, we haven't changed velocity, which means our average acceleration is zero!

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What is the function of a capacitor in an electric circuit
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2 years ago
With an average acceleration of â1.2 m/s² , how long will it take a cyclist to bring a bicycle with an initial speed of 6.5 m/s
julsineya [31]

Answer:

5.42 s

Explanation:

Using the equation of motion,

v = u + at ..................... Equation 1,

Where v = Final velocity, u = initial velocity, a = acceleration, t = time.

Making t the subject of the equation,

t = (v-u)/a ....................... Equation 2

Note: When the the bicycle is brought to a complete stop, the final velocity of the bicycle is  0 m/s and the bicycle is decelerating.

Given: v = 0 m/s, u = 6.5 m/s, a = - 1.2 m/s² ( decelerating).

Substituting into equation 2

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Hence the time take for the cyclist to bring the bicycle to complete stop = 5.42 s

6 0
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4) What is the speed of a bike if it moves 50 meters in 5 seconds?
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