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earnstyle [38]
3 years ago
8

Find the initial velocity of a car which stops in 10sec, after applying brakes at the rate of 2m/s²

Physics
1 answer:
Dennis_Churaev [7]3 years ago
7 0

Answer:

20\ m/s

Explanation:

Since we are given time, acceleration, and final velocity, we can use the following formula to find the initial velocity:

v_f = v_i + at

Our given values:

v_f = 0\\a = -2\\t = 10\\

<em>Acceleration is negative because the car is slowing down.</em>

Add the values to the formula, and solve for v_i:

v_f = v_i + at\\0 = v_i + (-2)(10)\\0 = v_i -20\\20 = v_i

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A jet liner must reach a speed of 82 m/s for takeoff. If the
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Answer:

The acceleration that the jet liner that must have is 2.241 meters per square second.

Explanation:

Let suppose that the jet liner accelerates uniformly. From statement we know the initial (v_{o}) and final speeds (v_{f}), measured in meters per second, of the aircraft and likewise the runway length (d), measured in meters. The following kinematic equation is used to calculate the minimum acceleration needed (a), measured in meters per square second:

a = \frac{v_{f}^{2}-v_{o}^{2}}{2\cdot d}

If we know that v_{o} = 0\,\frac{m}{s}, v_{f} = 82\,\frac{m}{s} and d = 1500\,m, then the acceleration that the jet must have is:

a = \frac{\left(82\,\frac{m}{s} \right)^{2}-\left(0\,\frac{m}{s} \right)^{2}}{2\cdot (1500\,m)}

a = 2.241\,\frac{m}{s^{2}}

The acceleration that the jet liner that must have is 2.241 meters per square second.

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3 years ago
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svetoff [14.1K]

Answer:

An object responds to a force by tending to move in the direction of that force

Explanation:

The inertia of a body can be defined with the help of Newton's second law

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the force and the acceleration are vectors that point in the same direction and m is a scalar constant that relates the two vectors, this scalar constant is called masses and it measures the resistance of the bodies to the change of motion.

From the previous statement we see that the statement that best describes inertia is:

An object responds to force by tending to move in the direction of the force.

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