Two runners start one hundred meters apart and run toward each other. each runs ten meters during the first second. during each second thereafter, each runner runs ninety percent of the distance he rane in the previous second

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.