Question

A ball is thrown vertically up. If the ball reached at maximum height in $3s$. Assume air resistance is negligible. The magnitude of the acceleration of the ball at the instant it reaches its maximum height is most nearly:

• A. zero
• B. $5m/s^2$
• C. $10m/s^2$
• D. $12m/s^2$
• E. $20m/s^2$

Answer 1

The correct option is C $10m/s^2$

Gravitational force always acts on the ball in the downward direction, thus an acceleration due to gravity always point in the downward direction with a constant magnitude $10m/s^2$