Question

A bullet is fired from the tank at some angle with horizontal. Assume air resistance is negligible. Choose the correct option which is NOT constant throughout 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 of attraction acting downwards. Hence there is acceleration only in vertically downwards direction which is constant and equal to $g$.

Thus the horizontal acceleration is also constant and equal to zero.

Hence there won't be any change in horizontal velocity. However due to vertical constant acceleration, the vertical velocity would constantly change.

Hence correct answer is option B.