A 0.20kg ball moves horizontally without friction. In a qualitative energy-bar chart, the kinetic-energy bars at positions 1 and 2 have heights of 2 units and 8 units, respectively. One unit corresponds to 1.0J of energy.
What is the ratio of the ball’s speed at position 2 to its speed at position 1?
a) 1.73
b) 4
c) 2
d) 0.50