Question

Identify which of the following is NOT true about the projectile launched from the ground at an angle (neglecting air resistance)?

• A. The horizontal velocity h constant.
• B. The vertical acceleration is upward during the first half of the flight, and downward during the second half of the flight.
• C. The horizontal acceleration is zero.
• D. The vertical acceleration is 10 m/s${}^2$
• E. The time of flight can be found by horizontal distance divided by horizontal velocity.

Answer 1

Answer: (B)

The vertical acceleration is upward during the first half of the flight, and downward during the second half of the flight.

A body projected in air always experience a gravitational force in the downward direction. Thus the acceleration of the body is always in the downward direction with constant magnitude.

Magnitude of acceleration $a=g=10m/s^2$ (downward)

Hence statement given in option B is false.