According to the concept of length contraction, what happens to the length of an object as it approaches the speed of light and
then slows down, eventually coming to a stop?
it is always observed as contracting.
it is always observed as the same length.
it is observed as expanding and then contracting back to its original length.
it is observed as contracting and then expanding back to its original length.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

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