Two-Dimensional Motion and Gravity — Test

Question 14 • Physics

Quinn is testing the motion of two projectiles x and y by shooting them from a sling shot. What can we say best describes the motion of the projectiles ? Assume air resistance is not a factor

Answer

The horizontal velocity of projectile cap x is changing, and the vertical velocity of projectile cap y is constant.

The horizontal acceleration of projectile cap y is negative 9 point 8 m/s squared , and the vertical acceleration of projectile cap y is 0 m/s squared .

The vertical velocity of projectile cap y is changing, and the horizontal velocity of projectile cap x is constant.

The horizontal acceleration of projectile cap x is negative 9 point 8 m/s squared , and the vertical acceleration of projectile cap y is 0 m/s squared .

Explanation

With air resistance ignored, gravity is the only force acting after launch. It makes each projectile’s vertical velocity change, while its horizontal velocity remains constant because there is no horizontal acceleration. Therefore, the choice saying projectile y’s vertical velocity changes and projectile x’s horizontal velocity is constant best describes their motion.

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