$A$ ball of mass $0.2 \, kg$ is thrown vertically upwards with a velocity of $2 \, m/s$. At the highest point of its trajectory:
$(i)$ What will be the magnitude of its velocity?
$(ii)$ What will be the magnitude of its acceleration?
$(iii)$ What will be the magnitude of the force acting on it? (Take $g = 10 \, m/s^2$.)

(N/A) $(i)$ At the highest point of the trajectory,the velocity of an object thrown vertically upwards is zero.
$(ii)$ Since the ball is moving under the influence of gravity,its acceleration is equal to the acceleration due to gravity,$g$. Therefore,$a = 10 \, m/s^2$.
$(iii)$ The force acting on the ball is given by $F = m \times g$. Substituting the values,$F = 0.2 \, kg \times 10 \, m/s^2 = 2 \, N$.