9. [1pt] 10 -10 1 2 3 Time sec) 4 5 The graph shows the upward speed of a ball t

Question

9. [1pt] 10 -10 1 2 3 Time sec) 4 5 The graph shows the upward speed of a ball thrown up with an initial speed of 27.0 m/s from the surface of Venus. Select whether an answer is True or False (for example, if only B is True, enter FTFFFF). 3.1s. A) The velocity vector and the acceleration vector are in the same direction after t B) The acceleration is 0 near t-3.1s. C) Maximum height is reached at about t-3.1s. D) The ball's KE increases during the first second. E) The ball's PE is a constant. F) The acceleration is constant.

Explanation / Answer

A.True

since after t=3.1 s ,the velocity vector is in downward direction and acceleration is also in downward direction.

B.False

since acceleration due to gravity is constant a=-9.8 m/s2

C.

True

at Maximum height ,the final velocity is zero ,from figure at t=3.1 s ,the velocity is zero.

d.

False

since speed decreases every second during upward motion

e.

False

since it chages with height

f.

True

Here acceleration is acceleration due to gravity

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