Question

A ball is thrown vertically upwards with speed 10 m/s and it comes back at initial point with same speed. At what point during flight is the ball's acceleration greatest ?

• A. The answer cannot be determined from this information
• B. The acceleration remains constant throughout the flight
• C. Just after lunch
• D. Just5 before landing
• E. At the highest point of the flight

Answer 1

The correct option is B The acceleration remains constant throughout the flight

During the whole flight of the ball, there is only one external force acting on the ball- the gravitational force of attraction acting vertically downwards, independent of the position or speed of the ball.
Thus the acceleration of the ball remains constant throughout and equal to $g$ downwards.