Question

4 multiple answer 1 point a ball is thrown upwards at an angle of 30 degrees from the horizontal. when the ball reaches the top of its path, what must be true? select all statements that are true for the ball at the top of its path. v_y is equal to 0 m/s v_x is equal to 0 m/s a_y = 0 m/s^2 a_y = -9.8 m/s^2

Explanation:

Step1: Analyze vertical velocity

At the top - most point of a projectile's path, the vertical component of velocity ($v_y$) becomes zero because the ball stops moving upwards and is about to start moving downwards. So, $v_y = 0$ m/s.

Step2: Analyze horizontal velocity

In the absence of air - resistance, the horizontal component of velocity ($v_x$) remains constant throughout the motion of the projectile. It is non - zero because there is no horizontal acceleration to change it. So, $v_x
eq0$ m/s.

Step3: Analyze vertical acceleration

The acceleration due to gravity acts downwards throughout the motion of the projectile near the surface of the Earth. Its value is approximately $a_y=- 9.8$ m/s² and does not change at the top of the path. So, $a_y=-9.8$ m/s² and $a_y
eq0$ m/s².

Answer:

$v_y$ is equal to 0 m/s, $a_y=-9.8$ m/s²