1. Atennis ball is shot straight up with an initial velocity of 34 m/s. What is its velocity two seconds after launch?

The speed (magnitude of the velocity) is 14.4 m/s

Explanation:

Vertical Launch Upwards

It occurs when an object is launched vertically up without taking into consideration any kind of friction with the air.

If vo is the initial speed and g is the acceleration of gravity, the speed vf at any time is calculated by:

A tennis ball is launched vertically up with an initial speed of vo=34 m/s. At time t=2 s, its speed is:

The speed (magnitude of the velocity) is 14.4 m/s

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t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.