A ball rolling at a velocity of 12 m/sec hits a wall after 36 seconds. What is the acceleration of the ball?

Explanation

Acceleration is determined with the following equation:
${\rm{average acceleration = }}\frac{{{\rm{change in velocity}}}}{{{\rm{time}}}}$
$a = \frac{{{v_2} - {v_1}}}{t} = \frac{{0 - 12m/\sec }}{{36\sec }} = - 0.334m.{\sec ^2}$