A student hurls a baseball directly upward with an initial speed of 40 m/s. Late

Question

A student hurls a baseball directly upward with an initial speed of 40 m/s. Later, the student catches the baseball at the same position from which it was released. For the following statements, displacements are measured relative to the release point and the upward direction is positive.

During the entire flight, the velocity of the baseball is never negative. T or F
The baseball spends an equal amount of time moving upward and moving downward. T or F
During the entire flight, the displacement of the baseball is never negative. T or F
During the entire flight, the acceleration of the baseball is negative. T or F
In the instant just before the student catches the baseball, the magnitude of the velocity is the same as it was the instant after the student released the baseball. T or F
At its highest point, the baseball has zero velocity. T or F
At its highest point, the baseball has zero acceleration. T or F

Explanation / Answer

1) F on the way down is negative
2) T voy/g going up and down same, thus total flight time is voy/g*2
3) F y(t)=voy*t-1/2*g*t2
4) F acceration is allows positive
5) T
6) T

7) F acceleration is constant

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