Which of the following five velocity versus time graphs represents the motion of

Question

Which of the following five velocity versus time graphs represents the motion of an object that is thrown vertically in the air? The positive direction is upward. Select one. A crate rests on a rough horizontal surface. A cadet pulls on it with a 10-N force oriented in three different directions as shown below. In each situation, the crate does not move. Rank the situations shown below according to the magnitude of the force of static friction acting on the crate that is required to keep it from moving. Select one. a. 1=2=3 b. 2

Explanation / Answer

V=U+at=U-gt this explains the first one the velocity is linearly decreasing

2)

friction= horizontal component of force        (since the body does not move)

in first case f=10N

in second case f=10cosA N

in third case f=0

so ,3<2<1

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