If the force of gravity suddenly stopped acting on the planets, they would

a. spiral slowly towards the sun.
b. continue to orbit the sun.
c. continue moving straight in the direction they are traveling.
d. spiral slowly away from the sun.
e. fly straight away from the sun.

c

Explanation:

If the Force of gravity suddenly stops acting on Planets then Planets would continue to move straight in the initial direction.

Gravity constantly acts on Planets to change their trajectory each instant thus in absence of it if a planet is moving in a circular path then it would follow the path of the tangent to the circular path as gravity force is absent to change its trajectory.        

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.