Question

test information description instructions from the list of choices, select the one best answer. multiple attempts not allowed. this test can only be taken once. force completion this test can be saved and resumed later. your answers are saved automatically. question completion status: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 moving to another question will save this response. question 19 of 25 question 19 4 points save answer (problem reference 3 - 2) a projectile fired from a gun has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively. what is the acceleration of the projectile when it reaches its maximum height? a. 9.8 m/s², downward b. 0 m/s² c. 4.9 m/s², downward d. 9.8 m/s² > a > 0 m/s², downward

Explanation:

Step1: Analyze forces on projectile

The only force acting on a projectile in free - fall (neglecting air resistance) is the gravitational force.

Step2: Determine acceleration

The acceleration due to gravity near the Earth's surface is approximately $g = 9.8\ m/s^{2}$ and acts downward throughout the motion of the projectile, including at the maximum - height. At maximum height, the vertical velocity is zero, but the gravitational acceleration still acts on the projectile.

Answer:

A. $9.8\ m/s^{2}$, downward