Final Answer:
At the top of its trajectory, the projectile is moving at 0 m/s.
Explanation:
A projectile is an object that is projected or thrown into the air and then moves under the influence of gravity. When a projectile is fired straight upward at 103 m/s, it is subject to the force of gravity, which causes it to accelerate downwards. As it moves upwards, its speed decreases due to the pull of gravity, and as it moves downwards, its speed increases. The projectile reaches its maximum height at the top of its trajectory, where the force of gravity is equal to the force of the initial launch, resulting in a velocity of 0 m/s. This occurs at the highest point of its trajectory and is known as the apex.
At the apex, the projectile is momentarily stationary, with a velocity of 0 m/s. This is because the force of gravity has most of its effect on the projectile at this point, and the projectile has no initial velocity, and no acceleration. This means that the projectile is not moving, and its speed is 0 m/s.
At the top of its trajectory, the velocity of the projectile is 0 m/s. This is because the force of gravity is equal to the force of the initial launch, resulting in a velocity of 0 m/s. At this point, the projectile is momentarily stationary, with a velocity of 0 m/s. This is because the force of gravity has most of its effect on the projectile at this point, and the projectile has no initial velocity, and no acceleration.
Once the projectile reaches the apex, it begins to move downwards due to the force of gravity. This is because gravity accelerates the projectile downwards, increasing its speed until it reaches the ground. At this point, the velocity of the projectile will be equal to the initial velocity of the launch, 103 m/s.
In conclusion, the projectile is moving at 0 m/s at the top of its trajectory. This is because the force of gravity is equal to the force of the initial launch, resulting in a velocity of 0 m/s. At the apex, the projectile is momentarily stationary, with a velocity of 0 m/s, as it has no initial velocity and no acceleration. Once the projectile reaches the apex, it begins to move downwards due to the force of gravity, increasing its speed until it reaches the ground. At this point, the velocity of the projectile will be equal to the initial velocity of the launch, 103 m/s.