which of the following ideas is true about projectile motion with no air drag 35

Question

which of the following ideas is true about projectile motion with no air drag 35) Which of the following ideas is true about projectile motion with no air drag 2 2 A) Vxvy-constant B) The horizontal motion is independent of the vertical motion. C) The acceleration is +g when the object is rising and -g when falling. D) The trajectory will depend on the object's mass as well as its initial velocity and launch angle E) The velocity of the object is zero at the point of maximum elevation. Figure 3.1 30° 20m

Explanation / Answer

The correct option is (B)

A. As the object is experiencing force due to gravity, its velocity keeps changing. So, this is not correct.

B. The object moves as if the vertical motion is independent of horizontal motion.

C. Gravity doesn't change its direction its always in the vertically downward. So, g cannot have two different signs in a given problem.

D. Kinematics of an object never depend on mass. For example you can look at kinematic equations. Mass becomes relevant only when you consider the force acting on the particle. So, this is false.

F. At the point of maximum elevation, the y component of velocity is zero but not x component. So, false.

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