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 speed of the projectile when it is at the highest point in its trajectory?
A)0 m/s
B)20 m/s
C)30 m/s
D)40 m/s
E)50 m/s

Question

Quizplus · Accepted Answer

At the highest point of the trajectory, the vertical component of velocity is zero. This means that the projectile has lost its vertical speed and is moving only in the horizontal direction at a speed of 30 m/s. Since the horizontal component of velocity remains constant, the speed of the projectile at the highest point is equal to the horizontal component of velocity, which is 30 m/s. Therefore, the correct choice is C) 30 m/s.

A Projectile Fired from a Gun Has Initial Horizontal and Vertical