Question

You launch a ball in the air with an initial velocity of 25 m/s.
What is the velocity at the top of the arc before it starts back down?
A. 25 m/s
B. 20 m/s
C. O m/s

Answer 1

The velocity of the ball at the top of the arc before it starts back down is 0 m/s.

The given parameters;

initial velocity of the ball, u = 25 m/s

The velocity of a projectile decreases as the projectile moves upwards and eventually becomes zero (0) when the projectile reaches maximum height. The velocity also increases as the begins to descend and it will become maximum before the object hits the ground.

The final velocity of the projectile is calculated as;

$v_f = v_0 -gt$

where;

• $v_f$ is the final velocity of the object at maximum height
• $v_0$ is the initial velocity of the object
• g is acceleration due to gravity
• t is the time of motion

At maximum height;

$v_f = 0$

Thus, we can conclude that the velocity of the ball at the top of the arc before it starts back down is 0 m/s.

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