How high would you have to raise an object on a pendulum, in relation to the lowest point in its swinging motion, in order to achieve a velocity of 9.9 m/s at the lowest point?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.