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a ball is thrown straight up into the air with an initial speed of 8.0 m/s. a. how long does it take for the ball to reach its highest point? b. what is the maximum height the ball reaches above the ground?

t=0.816 s

y=3.26 m

Explanation:

Vertical Launch

If an object is thrown vertically in free air (no friction considered), it starts to move upwards at its maximum speed and the acceleration of gravity acts to brake it. At a given time, the object stops in mid-air and starts to fall back to the launching point.

The height of the ball at any time t is given by

Where vo is the launching speed, g is the acceleration of gravity and t is the time

The speed of the ball is

a) The ball will keep going upwards until it runs out of speed. It happens when

Solving for t

b) The maximum height is achieved at the time found above:

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.