In optics, what is the optical power in diopters of a thin converging lens with a focal length of $f = + 0.25 m$ ?

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In mechanics, a vehicle accelerates uniformly from rest at $2.5 m/s^{2}$ for $6 s$ . What is its final velocity?
In mechanics, how far does an object fall from rest in free fall after $3 s$ (taking $g = 9.8 m/s^{2}$ )?
In mechanics, what net horizontal force is required to accelerate an $800 kg$ car at $1.5 m/s^{2}$ ?
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