An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is 4x that of the Earth, its speed two seconds later would be

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

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If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant