3. Someone at the third-floor window (12.0 m above the ground) hurls a ball downward at an angle of
45 degrees with a speed of 25 m/s. How fast will the ball be traveling when it strikes the sidewalk
below?

Explanation:

Given:

Now we find the vertical component of the initial velocity downwards:

Now the final vertical velocity of the ball when it hits the ground:

using the equation of motion,

Since the horizontal component of the motion is uniform since no force acts in the horizontal direction:

Now the resultant final velocity:

answer is slate

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