Question

A bullet is fired from the tank at some angle with horizontal. Assume air resistance is negligible. Which of the following option changes direction during the flight of the projectile?

• A. Horizontal velocity
• B. Vertical velocity
• C. Horizontal acceleration
• D. Vertical acceleration
• E. Angle at which the projectile is launched

Answer 1

The correct option is B Vertical velocity

The only force acting on the projectile is the gravitational force on it due to earth. This force is equal to $mg$ vertically downwards.

Hence the acceleration of the projectile is $g$ vertically downwards. This acceleration continuously changes the vertical velocity during the flight and its direction changes while falling down.