Approximately 150-200 species.
Answer:
-4.4 m/s
Explanation:
Since the ball is thrown upward, we can ignore the horizontal velocity. This means that the vertical velocity is 25 m/s. The vertical acceleration is -9.8 m/s^2 (g). This means that after 3 seconds, the velocity would've decreased by 9.8 m/s^2 * 3 s. This is 29.4 m/s.
This should be subtracted from the initial velocity:
25 m/s - 29.4 m/s = -4.4 m/s
Hope this helps!
There's not enough information given to answer the question.
The speed depends on the kinetic energy of the bob at the bottom of
the first swing.
THAT depends on how high above its 'resting' position it was before
it was released, and THAT depends on how long the string is and
how far to the side you pulled it before you let it go.