A 28 kg ball moving to the right at 6.3 ms collides elastically with a 28 kg block moving at -4.9 ms . Find the final velocity of the 28 kg block.

Which of the following is a true statement about the acceleration ~a of the pendulum bob ~a is equal to the acceleration due to gravity. ~a is perpendicular to the bob’s trajectory. ~a is equal to the instantaneous rate of change in velocity. ~a is tangent to the bob’s trajectory.