Physics
A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 110 feet per second. After how many seconds does the ball attain its maximum height?

5.41 sec
3.44 sec
4.65 sec
2.87 sec

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The liquid surface falls down only at the center of the tank
None
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The surface of the liquid remains horizontal

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