Early test flights for the space shuttle used a "glider" (mass of 970 kg including pilot). After a horizontal launch at 500 km/h at a height of 3500 m , the glider eventually landed at a speed of 210 km/h .

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

d eras and periods

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle