A ball of mass m is thrown vertically upwards | vedclass

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(C) Let the mass of the ball be $m$. The forces acting on the ball are the gravitational force ($mg$ acting downwards) and the air resistance force ($

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$g$

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(C) Let the mass of the ball be $m$. The forces acting on the ball are the gravitational force ($mg$ acting downwards) and the air resistance force ($F_r = -kv$,where $k$ is a constant and $v$ is the velocity).At any point,the net force is $F_{net} = -mg - kv$ (taking upward as positive).The acceleration is $a = F_{net}/m = -g - (k/m)v$.At the highest point,the velocity $v$ of the ball is $0$.Substituting $v = 0$ into the acceleration equation: $a = -g - (k/m)(0) = -g$.The magnitude of the acceleration is $|a| = g$.

$A$ ball of mass $m$ is thrown vertically upwards. Assume the force of air resistance has magnitude proportional to the velocity,and direction opposite to the velocity. At the highest point,the ball's acceleration is

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