What is the net force needed to lift a full grocery sack (weighing 210 N) needed to accelerate the grocery sack upward at 1.5m/s2? *

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.